This depends on the type of drug screen. If it is sent off to a lab, commonly used by porbation/parole/drug courts and businesses that conduct drug testing before you are hired then you must assume that they test for all abuseable drugs. Take home drug testing kits that you can buy from your local supermarket say the drugs that they test for on the front/back of the box. For example a 6 panel drug testing kit will test for 6 commonly abused drugs which may include but not limited to: Opiates (if it does not specifically say oxycodone then it does not test for oxycodone but for other opiates such as heroin/morphine) , cocaine, marijuana (THC), methamphetamines, amphetamines, and/or Ecstasy. The more expensive drug testing kits can test up to 12 drugs including but not llimited to Opiates, Oxycodone, Marijuana, Ecstasy, Cocaine, Methamphetamines, Amphetamines, Benzodiazepins (xanax, Valium ect) , Alcohol, Barbituites, Ecstasy, and PCP. Check the box for the list of drugs that are tested for in the drug screen kit.