I saw on TV tonight Loughner tried to join the Army but was rejected. Due to the Privacy Act the Army refuses to say why but I think it’s obvious.
The guy is a pothead (spoken by several sources). I suspect the Army was willing to overlook some past usage but he wasn’t about to quit and they won’t overlook that fact. I’d make the judgement that he was probably a daily smoker for at least five years.
I saw one quote that said, ‘he didn’t make it past the urinalysis’. which would jive with his arrest for drug possession in 2007.