To test to see if it numbs the gums, as cocaine should. It’s not that good of a test for the user to be honest, as it could just be cut with something like lidocaine to create a similar result. But for law enforcement it at least suggests it’s some sort of illegal substance.
A better test for users in my experience, as they already know it’s cocaine and instead want to see how pure it is, is to rub it between your fingers and see how easily it dissolves. Purer stuff should be silky smooth and disappear without you even feeling it, which is hard to replicate (but I’m not exactly Pablo Escobar so it’s not an exact thing)
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