Well, dear, I'm, assuming you are due to have some kind of drug test, and are concern about passing it?
Why not instead, share what you have taken that you are fearful of showing up?
A drug test looks for more than narcotics, too. They tyopically look for benzos (Ativan, Klonopin, Xanax, Valium), cocaine, opiates (Vicodin, Percocet), and others. There are different kinds of drug tests. There's really no way to know until you take it.