Some fantastic info there and a good read! To add a bit to what Ellen said, what if give parents a few clues as to behaviors to watch for in relation to certain drugs. For instance, meth is huge right now. Fast talking, babbling about nonsense and insisting it’s vastly important, sniffing all the time, crashing for an entire day following heavy use… Unfortunately, I could go on and on, because I was once completely addicted to that crap. Thank God I’m off and I can totally relate to what you’re saying about the yearning never going away.
Anyway, it might be interesting to provide some common symptoms of use. Behavioral signs to look for.