Depends a lot where you are applying. High security jobs you may need to prove friends and acquaintances back to high school. I had to get bonded for one job and had to prove - everything, basically. (This came up while working in a medical office, that got robbed. After the robbery management decided we would have to be bonded to continue employment. Eventually believe the cleaning service performed the robbery. But if I hadn't been able to prove every fact I had stated, who knows what would have happened to me.)