I see. Well, I would tend to argue that this man down the street did not lose his marbles from a 'bad' dose, as you also suggested, but rather a slew of other bad decisions he made or through natural imbalances aggravated by chemical abuses. I'm definitely not trying to argue with you here, but there is such an infinitessimally small chance you'll get some poison posing as LSD. I've been around the block a while I have never heard anything of the sort. There are many chemicals put onto blotter or into panes such as DOx's that are claimed to be LSD and if you are unlucky enough to land yourself an imposter you still are not going to turn into the man down the street as a result of it 99.999% of the time. But of course the risk is there, just like jumping into your car everyday. If the risk is too great for you, then by all means avoid it. But when you think about, all life is is one big risk/reward game, generally speaking, and that, my friend, can only be weighed in each and every one of our own minds.