what are chemicals used in clandestine labs
1 Controlling the sale and distribution of essential and precursor chemicals used in clandestine methamphetamine labs. 2  Controlling the sale and distribution of essential and precursor chemicals is widely considered one of the most effective responses to clandestine methamphetamine labs and drug trafficking. Controlling the sale and distribution of essential and precursor chemicals used in clandestine methamphetamine labs. 2  Controlling the sale and distribution of essential and precursor chemicals is widely considered one of the most effective responses to clandestine methamphetamine labs and drug trafficking.