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Old 03-04-2012, 07:41 AM
psychonaut psychonaut is offline
Join Date: Apr 2001
Location: Europe
Posts: 5,364
If heroin is like other opiates, it's probably bitter. If you had a bag of unidentified powder, and knew for certain that it was either heroin or (say) flour, then you could probably identify it by taste.

The general problem of identifying an unknown powder is very stupid to solve by taste. You have no idea what the powder could be—it might be something completely innocuous like flour, or it might be a deadly poison. Even if you're certain that the substance is some sort of recreational drug, it's still pretty stupid to taste it. Some drugs are sufficiently potent that putting even a tiny amount on your tongue will give you a massive overdose. For example, LSD is also a white powder, but its recreational doses are measured in micrograms—putting a macroscopic quantity on your tongue, or even on your skin, is a recipe for disaster (albeit likely a non-life-threatening one).