I am not any of those but have some conflicting thoughts on the subject.
As a father I would prefer if sex offenders, especially child molesters, were not allowed on a midway; whether working or not.
The problems I see is who pays for it? When I was on United in the summertime we could have 300+ show employees, not counting book-ins etc. If something like this is/was required at every fair the cost could be prohibitive.
The other problem, what level of a record prevents people from doing what jobs? Who decides what is acceptable and what is not? If you deny anyone with a record the opportunity to work then what will their alternative be?
I kind of agree that if someone is not allowed to work somewhere then they should not be allowed to be there but how to do that? A person has medical training but has a record so cannot work in a hospital but if sick/hurt could not go there? The reason I included this is once a precedent is established it carries over to other things.
Wish I knew the answers instead of the questions, might make a few dollars on it. [:I]