This is a good way if you purchase pills and are curious to see if they are fake. This is more towards pain killers but could be applied on any pill. All you need is a scale and the weight of the legit pill. you can use a real pill to find the weight or find it online. then see if the weights match. If they don't more then likely they are fake. This isnt a fool proof way but is a easy way to see if there legit.
I've come to the conclusion that most pills offered on dnm's are represses or fakes... AS long as it has the active ingredient idc if its real or fake..just want the same effect.