Empirical Evaluation of the Reliability of Photogrammetry Software in the Recovery of Three-Dimensional Footwear Impressions

This paper examines the reliability of Structure from Motion (SfM) photogrammetry as a tool in the capture of forensic footwear marks. This is applicable to photogrammetry freeware DigTrace but is equally relevant to other SfM solutions. SfM simply requires a digital camera, a scale bar, and a selection of oblique photographs of the trace in question taken at the scene. The output is a digital three-dimensional point cloud of the surface and any plastic trace thereon. The first section of this paper examines the reliability of photogrammetry to capture the same data when repeatedly used on one impression, while the second part assesses the impact of varying cameras. Using cloud to cloud comparisons that measure the distance between two-point clouds, we assess the variability between models. The results highlight how little variability is evident and therefore speak to the accuracy and consistency of such techniques in the capture of three-dimensional traces. Using this method, 3D footwear impressions can, in many substrates, be collected with a repeatability of 97% with any variation between models less than ~0.5 mm.     

Fatal motorcycle accidents and alcohol

A series of fatal motorcycle accidents from a 7-year period (1977-1983) has been analyzed. Of the fatalities 30 were operators of the motorcycle, 11 pillion passengers and 8 counterparts. Of 41 operators 37% were sober at the time of accident, 66% had measurable blood alcohol concentration (BAC); 59% above 0.08%. In all cases where a pillion passenger was killed, the operator of the motorcycle had a BAC greater than 0.08%. Of the killed counterparts 2 were non-intoxicated, 2 had a BAC greater than 0.08%, and 4 were not tested. The results advocate that the law should restrict alcohol consumption by pillion passengers as well as by the motorcycle operator. Suggestions made to extend the data base needed for developing appropriate alcohol countermeasures by collecting sociodemographic data on drivers killed or seriously injured should be supported.     

Gallup Polling Accuracy in a Multi-Party Context: An Empirical Study of Twelve Danish Political Parties 1957-80*

This article examines the accuracy of the Gallup poll in a situation involving multiple political parties of different sizes Using data collected by the Danish Gallup Institute 1957–1980. the article demonstrates that polling results, except those of small parties, are well within the sampling error. An explorative analysis of the data, showing that there is a normal distribution of the differences between election results and polling values, provides the possibility of a simple method of interpreting Gallup poll data at a desirable level of confidence.     

A survey of online harassment at a university campus

This exploratory study of 339 students at the University of New Hampshire found that approximately 10% to 15% of students reported receiving repeated e-mail or Instant Messenger (I-M) messages that "threatened, insulted, or harassed," and more than half of the students received unwanted pornography. Approximately 7% of students reported online harassment to an authority. Messages originated from strangers, acquaintances, and significant others. No difference in online harassment was found based on demographic variables except sexual orientation. Sexual minority students were more likely to receive online harassment from strangers than were heterosexual students. Implications for further research and for policy/program development are discussed.     

PARENTS BEYOND CONFLICT

This article describes a parent education program for high-conflict families in the Multnomah Country Circuit Court, Portland, Oregon. The method emphasized an educational approach teaching conflict resolution skills. This course was rooted in the tenets of cognitive restructuring: if parents think differently about the other parent and their shared task of raising their children, they will feel differently, and they will act differently. The authors beleived many of the difficulties between parents were caused by the negative perception of the other parent created during the spousal relationship. They also believed the key to successful co-parenting is to reframe these perceptions emphasizing cooperation and joint problem-solving. Furthermore, they believed as the cooperation and joint problem-solving improvement would have a positive, reinforcing effect. Finally, the authors believed parents must learn to separate conflict in the spousal role from conflict in the parenting role.     

Public's and police officers' interpretation and handling of domestic violence cases: divergent realities

The public's and police officers'interpretation and handling of realistic hypothetical domestic violence cases and their stereotypic views about domestic violence are discussed. A sample of 131 experienced officers, 127 novice officers, and 157 adult laypersons were randomly assigned to read a domestic violence case. Experienced officers were more likely to arrest only the husband than were laypersons or rookie officers even when respondents inferred that the husband was primarily responsible or had used violence before. Experienced officers considered their stereotypic beliefs about battered women's propensity to use self-defense in arriving at their arrest decision whereas laypersons and rookie officers did not. These findings indicate that the public and police officers have not adopted the feminists' message that arrest is the best response to handle all domestic violence cases. Policy implications are discussed.