Ceres - you have a lab though, or at least have access to one. Most of us don't. There's a certain element of risk you just need to take when it comes to "street" drugs. Banging a fat line up your beak straight off the bat is one thing you can certainly avoid, but we can't all get the super-duper microscope out & eyeball 0.1 of a mg.
If I buy something I generally assume it is what it's meant to be, or at the worst it's cut to fuck with something that isn't going to do me any immediate harm. I don't really have any other options. Other than not taking drugs, but that's not an option lol. Sure I could get a few reagent kits or whatever but they can't tell me exactly what I've got. I need to do what I can to minimise the risks (not buying off random cunts being the main one) but they're still there. You can't just expect everyone to never take drugs unless they're 100% certain what they've got is what they're expecting to get.
For example - How many folk on here have been fucked over by a pipz pill back when they first started flooding the place?