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.

[Stay on top of transportation news: Get TTNews in your inbox.] This story appears in the Aug. 17 print edition of Transport Topics. After two years of study, a federal drug advisory board has issued ...