A misdemeanor, butr at the time, i was charged with assault and fingerprinted x.x . And I'm honest, I have a job now (not much, but still a job regardless). But i never made it past interviews (i probably sucked and my clothing choices didn't help xD) and damn..I guess honesty does really make a difference.
I always overdress for interviews, even if it's just an initial written exam. The biggest thing employers are looking for is to find somebody that can get along with others and is honest. As long as you meet the minimum qualifications for the position itself, the rest can usually be taught onsite. Lot's of places actually prefer less experience in the field so that they can train you with their methods instead of bringing in somebody that will think they already know what to do.