Estimating the probability of allelic drop-out of STR alleles in forensic genetics

In crime cases with available DNA evidence, the amount of DNA is often sparse due to the setting of the crime. In such cases, allelic drop-out of one or more true alleles in STR typing is possible. We present a statistical model for estimating the per locus and overall probability of allelic drop-out using the results of all STR loci in the case sample as reference. The methodology of logistic regression is appropriate for this analysis, and we demonstrate how to incorporate this in a forensic genetic framework.     

Deterrence and delinquency: An analysis of individual data

Is commission of crime deterred by fear of arrest? Individual self-reported data on the commission of three crimes are analyzed in relation to perceived probabilities of arrest for more than 3000 French-speaking teenagers of the Montreal school population in 1974. The crimes are shoplifting, drug use, and stealing an item worth more than $50.00. In addition to the effect of the individuals' perceptions of the probability of arrest for the three crimes, age, sex, and previous arrest record are also taken into account. The data are all categorical. A multivariate log-linear probability model is estimated in order to test hypotheses concerning the direction and magnitude of bivariate associations among the variables. We conclude that there is clear evidence of a negative association between the subjective probability of arrest for each crime and the frequency of commission of that crime. We also find some negative cross-effects of the perceptions of the probability of arrest for one type of crime on the commission of another, holding constant the direct effects.     

The use of wildcards in forensic DNA database searches

Forensic genetic databases contain millions of DNA profiles worldwide. An allelic drop-out at a heterozygous locus (two different alleles) erroneously results in an observed homozygous profile. To guard against this, wildcards are induced for homozygous profiles. The wildcard represents any allele including the observed allele.In this paper, theoretical expressions for the number of matching loci are derived, results shown from a Danish dataset with more than 50,000 DNA profiles and simulations used to link homozygosity with the drop-out probability, which best mimics wildcard matching.     

An economic model of social sensitivity: The case of individual criminal behavior

In general, economists have modeled criminal behavior as a problem in time allocation under uncertainty. Their Friedman-Savage utility models have been based on the binomial probability distribution and then tested using aggregate data on crime rates and neglect the nonpecuniary aspects of crime. This paper overcomes the shortcomings of previous work. Specifically, criminal activity is modeled with an underlying geometric probability process and explicitly accounts for the moral and social compromise involved in becoming a criminal. The empirical model enables the quantification of the criminal's moral and social sensitivity using data based on a consolidated file of police records and a cohort survey of criminals and noncriminals. On the basis of this unique data set, it is found that the included individual criminals are risk averse and that gang membership reduces social sensitivity.     

Aoristic Signatures and the Spatio-Temporal Analysis of High Volume Crime Patterns

The spatial analysis of crime and the current focus on hotspots has pushed the area of crime mapping to the fore, especially in regard to high volume offenses such as vehicle theft and burglary. Hotspots also have a temporal component, yet police recorded crime databases rarely record the actual time of offense as this is seldom known. Police crime data tends, more often than not, to reflect the routine activities of the victims rather than the offense patterns of the offenders. This paper demonstrates a technique that uses police START and END crime times to generate a crime occurrence probability at any given time that can be mapped or visualized graphically. A study in the eastern suburbs of Sydney, Australia, demonstrates that crime hotspots with a geographical proximity can have distinctly different temporal patterns.     

Drug-Related and Economic Crime Among Unauthorized Latino Immigrant and Other Arrestees in California

Abstract

This paper employs 1994-1996 California Drug Use Forecasting (CALDUF) and 1994 Los Angeles County Mexican Immigrant Residency Status Survey (LAC-MIRSS) data to estimate the level and determinants of drug-related and economic crime among unauthorized Latino immigrant and other arrestees in California. Controlling for various potential individual, contextual and geographic determinants, logistic regression results suggest the use of illicit drugs, having entered the United States more recently and residing in a home without paying any rent or mortgage positively-and residing in a home where another is dependent on an illegal substance negatively-influenced being apprehended for a drug-related crime. Although being an unauthorized Latino resident also had no effect on having been arrested for an economic crime, U.S.-born blacks and Latinos as well as non-Latino immigrants were each more likely than non-Latino U.S.-born whites to be arrested, as were younger females. Working full time and depending on another for a place to live diminished the probability. In sum, although illicit drug use augmented the probability of having been arrested for a drug-related crime, neither this nor unauthorized residency status among Latinos increased the likelihood of being arrested for an economic crime. A concluding section discusses several policy implications.     

期待可能性理论的梳理

有必要站在非决定论的立场讨论期待可能性;有关期待可能性的部分观点分歧,缘于在不同意义上使用期待可能性概念;期待可能性虽然在德国受到冷落,但这仅限于故意的作为犯的情形,而且有其特定原因;我国目前应当采取规范责任论,使期待可能性理论发挥应有的作用;缺乏期待可能性既是某些法定的责任阻却事由的根据,也是超法规的责任阻却事由。     

DOES MARRIAGE REDUCE CRIME? A COUNTERFACTUAL APPROACH TO WITHIN‐INDIVIDUAL CAUSAL EFFECTS*

Although marriage is associated with a plethora of adult outcomes, its causal status remains controversial in the absence of experimental evidence. We address this problem by introducing a counterfactual life‐course approach that applies inverse probability of treatment weighting (IPTW) to yearly longitudinal data on marriage, crime, and shared covariates in a sample of 500 high‐risk boys followed prospectively from adolescence to age 32. The data consist of criminal histories and death records for all 500 men plus personal interviews, using a life‐history calendar, with a stratified subsample of 52 men followed to age 70. These data are linked to an extensive battery of individual and family background measures gathered from childhood to age 17 — before entry into marriage. Applying IPTW to multiple specifications that also incorporate extensive time‐varying covariates in adulthood, being married is associated with an average reduction of approximately 35 percent in the odds of crime compared to nonmarried states for the same man. These results are robust, supporting the inference that states of marriage causally inhibit crime over the life course.     

Cumulative impact: Why prison sentences have increased*

Why has the probability of going to prison after a felony conviction increased since the early 1980s? Social scientists often try to answer this question through macro‐level research that is aimed at examining correlations between prison admissions and crime rates or sociopolitical characteristics of states. That type of macro‐level inquiry, however, does not allow for a close examination of how characteristics of offenders changed over time, and whether such changes are consequential for understanding trends in the use of imprisonment. In the current study, I take a different approach—one in which case‐level data are observed over a lengthy time span—to investigate why the likelihood of going to prison for a given crime persistently increased for several decades. The results of analyses of more than 350,000 felony cases sentenced in Minnesota during a 33‐year period show that the probability of a defendant receiving a prison sentence increased from 1981 to 2013, as would be expected. The primary reason for the rising probability of imprisonment was the significant increase in the average offender's criminal record, which more than doubled during the observation period.     

“MIGHT NOT BE A TOMORROW”: A MULTIMETHODS APPROACH TO ANTICIPATED EARLY DEATH AND YOUTH CRIME*

Several researchers point to the anticipation of early death, or a sense of “futurelessness,” as a contributing factor to youth crime. It is argued that young people who perceive a high probability of early death may have little reason to delay gratification for the promise of future benefits, as the future itself is discounted. Consequently, these young people tend to pursue high‐risk behaviors associated with immediate rewards, which include crime and violence. Although existing studies lend support to these arguments and show a statistical relationship between anticipated early death and youth crime, this support remains tentative. Moreover, several questions remain regarding the interpretation of this relationship, the meanings that offenders attach to the prospect of early death, and the cognitive processes that link anticipated early death to youth crime. In this article, we address the limitations of previous studies using a multimethods approach, which involves the analyses of national survey data and in‐depth interviews with active street offenders.     

INCORPORATING ROUTINE ACTIVITIES,ACTIVITY SPACES,AND SITUATIONAL DEFINITIONS INTO THE SOCIAL SCHEMATIC THEORY OF CRIME

Simons and Burt's (2011) social schematic theory (SST) of crime posits that adverse social factors are associated with offending because they promote a set of social schemas (i.e., a criminogenic knowledge structure) that elevates the probability of situational definitions favorable to crime. This study extends the SST model by incorporating the role of contexts for action. Furthermore, the study advances tests of the SST by incorporating a measure of criminogenic situational definitions to assess whether such definitions mediate the effects of schemas and contexts on crime. Structural equation models using 10 years of panel data from 582 African American youth provided strong support for the expanded theory. The results suggest that childhood and adolescent social adversity fosters a criminogenic knowledge structure as well as selection into criminogenic activity spaces and risky activities, all of which increase the likelihood of offending largely through situational definitions. Additionally, evidence shows that the criminogenic knowledge structure interacts with settings to amplify the likelihood of situational definitions favorable to crime.     

Do perceptions of punishment vary between white-collar and street crimes?

Much has been learned about the relationship between sanction threat perceptions and criminal activity, yet little remains known about the factors that are associated with sanction threat perceptions. Moreover, because most researchers had studied deterrence within the context of street crime, even less is known about the factors that relate to sanction threat perceptions for white-collar crime. This study used data from a national probability sample to examine whether the determinants of perceived sanction certainty and severity for street crime were different from white-collar crime. Using robbery and fraud as two exemplars, the findings indicated that while public perceptions of sanction certainty and severity suggested that street criminals were more likely to be caught and be sentenced to more severe sanctions than white-collar criminals, respondent's perceptions of which type of crime should be more severely punished indicated that both robbery and fraud were equally likely to be perceived ‘on par.’ Additional results indicated that the correlates of certainty and severity were more similar than different, but that the results differed according to whether respondents were asked about the punishment that white-collar offenders were likely to receive as opposed to what they should receive.     

Can Making It Harder to Convict Criminals Ever Reduce Crime?

This paper attempts to find the optimal level of the burden of proof needed in criminal cases in order to minimize crime. It also aims to provide an explanation for the higher burden of proof required in criminal cases than civil cases. It assumes that police officers receive incentive payments for convictions in cases they investigate. Although the direct effect of a higher burden of proof requirement is to reduce the probability of conviction, the indirect effect is to force police officers to build stronger cases and put more effort into finding suspects who are more likely to be guilty. Moreover, the increase in the marginal probability of conviction potential criminals face when they actually commit a crime increases. These factors imply that a reduction in the burden of proof will not necessarily reduce crime.     

Race and the death penalty in Kentucky murder trials: An analysis of post-Gregg outcomes

This study examines the effect of the victim's race on the probability that an accused murderer is charged with a capital crime and sentenced to death in Kentucky. Our results show that blacks accused of killing whites had a higher than average probability of being charged with a capital crime (by the prosecutor) and sentenced to die (by the jury) than did other homicide offenders. This finding remains after we take into account the effects of differences in the heinousness of the murder, prior criminal record, the personal relationship between the victim and the offender, and the probability that the accused will not stand trial for a capital offense.     

The influence of police interventions and alternative income sources on the dynamic process of choosing crime as a career

This paper demonstrates how a rational process of choice may be influenced by both deterrence forces and economic opportunities. This choice is modeled by a dynamic (Markov) process which captures self-sorting by youth among the categories of innocents, desisters, and persisters. in crime. A key to the results is the introduction of the perceived probability of punishment and its influence on the sorting process. The analysis shows how this force and the availability, or lack of, economic opportunities or income sources modify transition probabilities. The long-run consequences will be a larger subpopulation of individuals who have experimented with crime but subsequently revert to crime-free behavior and a smaller subpopulation of individuals who commit a greater share of crime. Empirical evidence is based on data from the New Youth Cohort of the National Longitudinal Surveys.     

DO NEIGHBORHOODS GENERATE FEAR OF CRIME? AN EMPIRICAL TEST USING THE BRITISH CRIME SURVEY*

For a long time, criminologists have contended that neighborhoods are important determinants of how individuals perceive their risk of criminal victimization. Yet, despite the theoretical importance and policy relevance of these claims, the empirical evidence base is surprisingly thin and inconsistent. Drawing on data from a national probability sample of individuals, linked to independent measures of neighborhood demographic characteristics, visual signs of physical disorder, and reported crime, we test four hypotheses about the mechanisms through which neighborhoods influence fear of crime. Our large sample size, analytical approach, and the independence of our empirical measures enable us to overcome some of the limitations that have hampered much previous research into this question. We find that neighborhood structural characteristics, visual signs of disorder, and recorded crime all have direct and independent effects on individual‐level fear of crime. Additionally, we demonstrate that individual differences in fear of crime are strongly moderated by neighborhood socioeconomic characteristics; between‐group differences in expressed fear of crime are both exacerbated and ameliorated by the characteristics of the areas in which people live.     

LABELING,LIFE CHANCES,AND ADULT CRIME: THE DIRECT AND INDIRECT EFFECTS OF OFFICIAL INTERVENTION IN ADOLESCENCE ON CRIME IN EARLY ADULTHOOD*

Scholars have recently revitalized labeling theory as a developmental theory of structural disadvantage. According to this approach, official intervention increases the probability of involvement in subsequent delinquency and deviance because intervention triggers exclusionary processes that have negative consequences for conventional opportunities. The theory predicts that official intervention in adolescence increases involvement in crime in early adulthood due to the negative effect of intervention on educational attainment and employment. Using panel data on urban males that span early adolescence through early adulthood, we find considerable support for this revised labeling approach. Official intervention in youth has a significant, positive effect on crime in early adulthood, and this effect is partly mediated by life chances such as educational achievement and employment.     

The criminal career: Estimates of the duration and frequency of crime commission

This paper deals with measuring two dimensions of the criminal career: residual duration and frequency. It reports results from estimating the parameters of a model in which offenders have a probability of desisting from further participation in crime following a conviction and, if they persist, a rate of crime commission. The probability of desisting and the rate of commission are seen as varying with offenders' personal characteristics and criminal records. Moreover, this paper discusses the difficulty of estimating models in which failure to commit a new crime might be attributable either to termination of the criminal career or to a censored follow-up period. The paper reports both successful and unsuccessful estimation attempts and discusses complications when distinguishing empirically between duration and frequency.     

Revolving Roles in Drug-Related Crime: The Cost of Chronic Drug Users as Victims and Perpetrators

Numerous studies have established a strong connection between the use of illicit drugs and the commission of other illegal activities, including both predatory and property crimes. No study, however, has examined the cost of crimes associated with drug users both as victims and as perpetrators. In the present study, recent data were analyzed from a targeted sample of chronic drug users (CDUs) and a matched sample of non-drug users (NDUs) in Miami-Dade County, Florida, to estimate the incremental cost of crime associated with CDU. Two separate models were employed to estimate (1) the probability of being a victim or a perpetrator of crime and (2) the cost of crime for both situations. The cost measures were transformed to reduce the influence of extreme outliers, and a smearing technique was used to compare the cost of crime for CDUs relative to NDUs. The findings illustrate that criminal activity among CDUs is circular, extensive, and costly. Implications for law enforcement, criminal justice policy, and substance abuse treatment are discussed.     

RECIDIVIST IMPACTS OF DIFFERENTIAL SENTENCING PRACTICES FOR BURGLARY OFFENDERS

The research reported here attempts to examine the recidivist impacts of probationary sentences versus incarceration. Statistically controlled comparisons were run on a probability sample of 100 offenders sentenced for residential or commercial burglary convictions in 1971. Subsequent arrest, conviction. and imprisonment data were gathered from official agency records through March of 1975. The results of this study indicate that for persons sentenced for burglary the likelihood of subsequent conviction for a felony or for any crime is less for probationer offenders than for any other sentence type. The strongest predictors of recidivism (defined as subsequent conviction for crime) were age, previous incarceration experience, and sentence type. Length of sentence. type of release, and number of previous arrests were essentially unrelated to subsequent rates of recidivism.