T-Roy

You can buy chemical reagent tests that will give you reasonable certainty that what you're taking isn't meth/something else, but you're right that there's always a risk when taking an unknown substance that it could be a as yet unknown research chemical or cut with something else.

charged != convicted

OpenCyc is a really cool implementation of one solution to this problem.

The way it was explained to me, computers don't know that when you turn a full cup of coffee upside down, the liquid will fall out. Cyc attempts to provide a framework for that.

http://sw.opencyc.org