UDS
Drug/screening cut off levels ng/ml/length of detection
Etoh/20/12h
Amphetamines/1000/2-3d
Barbs/200/upto 30d
Benzos/200/upto 40d
Marijuana/50/upto 30 - 50 d
Cocaine/300/2-4d
Methadone/300/8-60h
Methaqualone/300/upto 7d
Opiates/300/2-4d
PCP/25/2-3d
Propoxyphene/300/1-3d
TCAs/1000/1-3d
Heroin/2000/1-2h
Screening test will be positive for opiates if poppy seeds are ingested (eg. bagels), if the screening cut-off is 300 ng/mL. Some labs have it at 2000 ng/mL