I don't think there would be any way for sure. It depends on what you mean, like laced with another form of drug (amphetamine, PCP ect) or laced/cut with stuff like mannitol, lidocaine, creatine, quinine. maybe if you knew reactive agents in the powder weather it be heroin or coke and tested them bit by bit to see but im just guessing. Where im from the coke is mostly always cut with creatine the stuff in musclebuilding formulas. I also heard it adds to the stimulating effect too.