Marijuana
Cocaine
Opiates
Amphetamines and Meth-Amphetamines
PCP

For Opiates they only test for Opium and Codeine derivatives. Oxycontin is technically an opiod and not an opiate because of the synthetic properties it has. The DOT test for pilots and truck drivers has not tested for this type of opiate before.

It has never tested for OTC meds like cold medication. The law still requires you to follow the rules for those meds. If you ever have a serious incident or accident and get a blood test afterwards they can find OTC meds, but a random drug test will not detect them.