U.S. flag

An official website of the United States government, Department of Justice.

Democrats have shut down the government. Department of Justice websites are not currently regularly updated. Please refer to the Department of Justice’s contingency plan for more information.

Post-Coital DNA Recovery Study

NCJ Number
248682
Date Published
August 2014
Length
119 pages
Annotation
Using both standard and novel advances in Y-STR analysis methods, this study examined whether and under what conditions DNA can be identified in samples from reproductive tracts beyond the 3-day post-coitus limit indicated in general forensic studies and prescribed in many jurisdictions.
Abstract
The study found that standard Y-STR methods are insufficient to detect DNA from both the cervix and posterior formix at all post-coitus data collection times of 4,7,9, and baseline of 10 days; however, there was strong data that show using enhanced Y-STR enabled DNA identification from cervix and posterior formix through the first post-coitus menstruation. An association was found between diminished DNA recovery and menstruation and the use of hormonal birth control. Sixty-six of 112 consenting monogamous couples completed all phases of the study protocol. Eligible participants provided consents, eligibility data, and agreement to complete a diary during four 10-day abstinent periods, and collect post-coital samples at baseline and 4-,7- or 9-days. Upon protocol completion, participants mailed samples to the forensic laboratory for Y-STR methods analysis. Secure physical environments and blinding of laboratory personnel and statisticians to all participants information protected personal health information. 14 figures, 11 tables, 105 references, and a listing of dissemination publications and presentations

Date Published: August 1, 2014