"In the US last year, 754,224 people were arrested for possession (not dealing or production) of marijuana."
It is, as Steve put it, simply insane.
If there's one University of Delaware policy I fully agreed with it was that they didn't arrest people for simple marijuana possession. The money and resources wasted by arresting folks for possession of weed is simply astounding.
Also, speaking from personal experience, it sucks having to divulge that you've been arrested even if it was for something trivial and there was no conviction.