[Colorado Doug]

Now the scene was staged to suggest some kind of drug issue with pot spread over the bodies, but that could well be a diversion.

I am not so sure it is a diversion. It could very well be a statement. Bare with me and consider this:
Tamerlan, who was becoming more religious, gave up his pot smoking ways. Perhaps he considered his former friends to be a bad influence on him. Maybe he broke down and smoked a bowl with them. Overcome with personal guilt he murdered them so that he wouldn't have to blame himself for his own actions. Dumping their own pot on them to show his disgust and prove that he was above that now. it really fits perfectly with islam, where women must cover themselves to remove temptation from the devotees of allah.

[TArcher]

>>Dumping their own pot on them to show his
>>disgust and prove that he was above that now.

Didn’t undo the pot-induced delusional psychosis though, did it.

http://www.google.com/#hl=en&sclient=psy-ab&q=marijuana-induced+psychosis