I can't help with a policy... we abide by Ohio Revised Code. In ORC 109.572, people must disclose to us (within 14 days) if they've been convicted of or plead guilty to any offenses on a list we have (from the state). If it isn't on the list, they don't have to disclose. We have time limits too, if they ARE convicted of something on the list but it's been longer than 5, 7, 10 years, they are fine. There are convictions where we cannot ever hire or continue to employ, too. I like this set up a lot.
Arrests aren't convictions. Citations aren't serious infractions. People do stupid things sometimes or are in the wrong place at the wrong time.
I'm of the opinion that a business doesn't need to know if it isn't relevant to the job/business.
Sadly, the only example I can think of is a person being found guilty for writing a bad check and the job is washing windows on skyscrapers.
Why that popped in my head, I have no clue. :)