Do they test for
the toxic drug that kills more people directly than all of the other drugs combined: alcohol? By the way Alcohol is finally categorized correctly as a dangerous toxic drug.
Link below list drugs ratio of fatal dose to effective dose. From least lethal (top) to most lethal (bottom). Amazingly cocaine is less lethal by ratio dose to effective dose than alcohol. Because alcohol is not illegal, that makes it ok.
Drugs and Toxicity - The Daily Dish - The Atlantic