In a urine screen can they tell which opiate you took?

The most commonly used urine drug test in the United States (SAMHSA-5) does not specifically indicate which opiate was taken. It tests for Amphetamines, Cocaine, Marijuana, PCP, and Opiates. In the case of opiates, it detects the presence of inactive opiate metabolites (morphinans, codeinones, etc.) So therefore it is impossible for the drug test to distinguish between the specific types of opioids (hydrocodone, oxycodone, codeine, morphine, and heroin will all be returned as a positive for opiate section.) There are methods such as Gas Chromatography urinalysis to detect the presence of more specific opiates. It can distinguish between heroin and oxycodone, so therefore there are certain drug testing methods that can tell if an individual is using illegal opiates and prescribed opiates.

Generally, the opiates will leave the body in 3 days or less, making them impossible to detect.

The bottom line is, if you are peeing into a cup, you live in the United States, and it has five sections which I mentioned above, then it can detect any conventional (non-synthetic) opiate.