My problem with discussing drugs is that people get so worked up with the word "drug". To answer the peanut question - your chance of killing your guest are far higher if you offered them a peanut that an E tablet, yet the papers focus on the "drugs".
So my question is whether this lad really was "under the influence" of drugs - which is inexcusable when flying, or he had traces in his system - as these are two very different things as BRL points out....