[FONT="]A urine drug test, also known as a urine drug screen or a UDS, is quick and painless. It tests your urine for the presence of certain illegal drugs and prescription medications. The urine drug test usually screens for alcohol, amphetamines, benzodiazepines, marijuana, cocaine, PCP, and opioids (narcotics).[/FONT]
http://www.healthline.com/health/urine-drug-screen
Not sure how accurate this site is, but it at least gives us an idea of what they might have been looking for.