You thought that wild weekend from months ago was ancient history? Think again. While blood tests only catch drug use from the past few days and urine tests stretch to maybe a few weeks, there’s a ...

Add Yahoo as a preferred source to see more of our stories on Google. Revised guidelines for drug-testing hair scheduled for publishing next year. (Photo: Jim Allen/FreightWaves) WASHINGTON — The U.S.

Hair analysis could be the key to understanding adolescent drug usage, as a new study uncovers almost double the number of children were found to be using substances than those who admitted to in a US ...

Old-School Hair Analysis Is Junk Science. But It Still Keeps People Behind Bars The technique, developed before DNA testing, can’t definitively tie suspects to crime scenes. Try explaining that to ...