This is another protective measure you can take for the children (and yourself). there are many sites which offer the same service. Some are free and some are not. I found this website to be very user friendly. The results post within seconds.
https://www.familywatchdog.us/
This will show you who, where and of what offense they are registered for. The whole “stranger danger” campaign has been proven to be a waste of resources and diligence. Strangers involved in child predation account for approximately 10% of cases. These types of sites help you find who and where.
Stay Safe Online!