Yes, extended benzodiazepines can be detected in a drug test. However, the type of test may be a factor in whether or not they will show up. Urine drug testing is more common since it is a fast, effective, and less expensive option, but it does look back on a shorter period of time (up to one week). If you need to identify drug use further back than one week, Health Street's hair drug testing option can identify usage approximately 90 days back.