It is important to be familiar with the some of the precursory signs of drug abuse. Changes in eating habits, sleeping habits, irritable mood, loss of weight, and a new social circle are all warnings that your child is abusing drugs. The most accurate way to tell is by administering a drug test. To buy drug tests online, the best place to go is http://drugtestsinbulk.com. They have a great selection of drug testing products and offer quick shipping options.