Since I don't know which sex offenders are lethal and which ones are simply youthful indiscretions, I keep my children away from them all. I also search the local database regularly for any who may have moved in near us.
My kids just don't go out trick or treating unattended, no matter what age they are. As they get older and less willing to be accompanied by mom, I follow them in the car as the meander down the streets.
They then have to sort through all of their candy with me, weeding out anything suspicious-looking (ie: loose wrapper) before they're allowed to eat any.
I'm so mean
Stormie