Recovery of Environmental Human DNA by Insects*,†

Abstract: We tested the hypotheses that foraging insects can acquire human DNA from the environment and that insect‐delivered human DNA is of sufficient quantity and quality to permit standard forensic analyses. Houseflies, German cockroaches, and camel crickets were exposed to dusty surfaces and then assayed for human mitochondrial and nuclear loci by conventional and qPCR, and multiplex STR amplification. Over two experiments, 100% of insect groups and 94% of dust controls tested positive for human DNA. Of 177 individuals, 33–67% tested positive and 13 yielded quantifiable human DNA (mean = 0.022 ± 0.006 ng; mean dust control = 2.448 ± 0.960 ng); four had at least one positive allele call for one or more locus; eight others showed multiple peaks at some loci. Results imply that application to routine forensic casework is limited given current detection methodology yet demonstrate the potential use of insects as environmental samplers for human DNA.     

Social disorganization theory and the college campus

Researchers and the mass media have focused increasing attention on campus crime in light of a few high-profile incidents. While rare, these incidents are important because college students are less likely to attend, spend time on, or participate in social activities on high crime campuses. The current study contributed to research on campus crime by exploring the generalizability of the updated social disorganization model to campus communities by using data collected from Peterson's Guide to Four-Year Colleges and the Uniform Crime Report for the year 2000. While social structural features of campus populations are clearly associated with rates of campus property crime, the role of social organization is less certain. These results have implications for future research and crime prevention planning on college campuses.     

The violent and sexual victimization of college women: is repeat victimization a problem?

Little attention has been given to repeat violent and sexual victimization among college women. Using two national-level data sets, the authors find that a small proportion of college women experience a large proportion of violent and sexual victimizations. Women are more likely to experience repeat sexual victimization than repeat violence incidents. Repeat victimization tends to happen in the same month of the initial victimization, and the most likely next type of victimization is by far the same type of victimization. Comparing incident-level characteristics of repeat incidents to single incidents, there are few differences, with the exception that, in a larger proportion of single incidents, women took self-protective action. Implications for prevention and educational programs are discussed.     

Leaving Home, Attending College, Partnership and Parenthood: The Role of Life Transition Events in Leisure Pattern Stability From Adolescence to Young Adulthood

Few researchers have examined the role that life transition events play in the maintenance of or change in leisure behaviors across the transition from adolescence to young adulthood. This study examines the role that leaving home, going to college, having a committed partner, and becoming a parent played in intraindividual change and stability in leisure patterns. The data were from the Michigan Study of Adolescent Life Transitions (MSALT), and were collected during the final year of high school and 3 years following high school. Results suggest that transition events are particularly useful in predicting female leisure pattern stability or change; going to college and leaving home were generally predictive of the maintenance of a stable leisure pattern, while becoming a partner and becoming a parent were predictive of change. For males, the most useful predictor of stability or change was leaving home. However, the nature of the relation of the transition events to pattern stability or change depended on the type of initial leisure pattern.     

Adolescent observers of marital violence

The relationship between observation of marital violence and adolescent behavior and adjustment was studied. One hundred and one predominantly white 13- to 18-year-olds from four residential treatment agencies and one youth shelter were interviewed. Approximately half reported witnessing marital violence and were compared with those not exposed to interparental violence with respect to depression, running away, use of violence toward parents, and approval and use of violence toward dating partners. Substantial numbers reported being depressed, running away, hitting their parents, and hitting and being hit by dating partners. However, the findings indicated only a modest effect of witnessing interparental violence, which was mediated by gender. Males exposed to spousal abuse were significantly more likely to have run away, report suicidal thoughts, and somewhat more likely to hit their mothers as compared to nonobservers. Witnessing marital violence was unrelated to females' behavior or well-being.