Exactly, unless you know what you’'re testing for, its pretty much trying to find a needle in a hay stack. His behaivor was consistent with stimulant psychosis (along with any other number of mental disorders). However the number of potential stimulents available legally or otherwise grows day by day. The true “bath salt” is either MDPV (3,4-methylenedioxypyrovalerone) and Mephedrone ( 4-methylmethcathinone). Both of which are almost impossible to acquire for the average person. However, that doesn’t mean there’s not a whole host of other stimulants that can’t take their place that haven’t made it on to the FDA’s radar yet. I could probably list 20 substances right now, that if abused, could cause stimulant psychosis and would be untraceable unless a gas spec analysis was used.
Hell good old fashioned Ritalin could spark a psychotic outburst in the right(wrong) person if overused