An actual background check.. To be honest I would end it right there. Not my bag.
A little google search or even asking to read through some of my other sites sure why not.
Some things are private, and can come out with time. He likely wanted some discretion or he'll, a chance. I can understand not being entirely up front. I can personally understand someone in that situation wanting.. Time...
Consider how many people would judge him instantly for having a record, before giving the chance to prove himself.