Low-intensity community supervision for low-risk offenders: a randomized,controlled trial

The Philadelphia Low-Intensity Community Supervision Experiment provides evidence on the effects of lowering the intensity of community supervision with low-risk offenders in an urban, US county community corrections agency. Using a random forests forecasting model for serious crime based on Berk et al. Journal of the Royal Statistical Society, Series A, 172(Part 1), 191–211, 2009, 1,559 low-risk offenders were identified and randomly assigned to either standard or reduced frequency of mandatory office visits. Treatment as assigned was substantially delivered at 4.5 probation visits per year versus 2.4, for as long as offenders remained on active probation or parole. In a one-year follow-up for all cases, outcomes examined were the prevalence, frequency, seriousness and time-to-failure of arrests for new crimes committed after random assignment was implemented. No significant differences (p = .05) in outcomes were found between standard and low-intensity groups. Non-significant differences for offense seriousness favored the low-intensity group. We conclude that lower-intensity supervision at the tested level of dosage can allow fewer officers to supervise low-risk offenders in the community without evidence of increased volume or seriousness of crime.     

The successful DNA typing of samples following a thermal cycler power loss

An approach for generating DNA profiles when critical samples have been consumed and a power outage occurs during the polymerase chain reaction (PCR) amplification reaction is described. This study demonstrates that a complete and accurate DNA short tandem repeat profile can be obtained: (1) when single source DNA samples are amplified for 26, 27, or 28 cycles using the Profiler Plus and COfiler Amplification Kits after an interruption in amplification, (2) from mock samples when PCR amplification has been interrupted early (after five cycles) or late (after 18 cycles) and the sample is subjected to an additional round of amplification, even after incubation of the sample at room temperature overnight, and (3) from nonprobative casework samples interrupted after approximately 18 cycles of amplification, an overnight incubation at room temperature and subjected to one or two additional rounds of PCR amplification for approximately 26 total cycles. Samples interrupted before five completed cycles and subjected to additional PCR cycles yielded variable results.     

Analyses of Beverage Remains in Drug Rape Cases Revealing Drug Residues ‐ The Possibility of Contamination from Drug Concentrated Oral Fluid or Oral Cavity Contained Tablets

In drug‐facilitated sexual assault (DFSA) cases, drug residues may be detected in beverage remains found in cups or glasses known to have been used by the victims. In this small naturalistic study, the possibility of beverages being contaminated, either by drug concentrated oral fluid or by oral cavity contained tablets, was investigated. Analysis of residues from cups containing soft drinks was performed by immunoassay and ultra‐performance liquid chromatography‐mass spectrometry (UPLC‐MS/MS). Beverage with both added tablets and spiked oral fluid was investigated, as well as simulation of swallowing tablets. Only the residues from added tablets were positive with immunoassay, while drugs were detectable in all cups using more sensitive UPLC‐MS/MS. In conclusion, the possibility of detecting drug residues in beverages due to a contamination, from either drug concentrated oral fluid or oral cavity contained tablets at a time of consumption, should be kept in mind when performing sensitive analysis.