Being a Dutchman, I can tell you we don't use stringent penalties.
Not at all, actually.
In fact, at dance festivals and at large clubs you sometimes have these stalls where they will check your drugs for you, so you don't overdose or take something that's mostly chemical shit. As you may have guessed, such testers are indirectly subsidized by the government a.k.a. taxpayers' money, but hey, at least the kids are doing illegal stuff safely!