I have a suggestion for giving out candy. In our area when my kids were little, a bunch of us mothers got together and when we gave out candy on begger's night, it was in a zip loc bag, taped shut with clear tape, with our mailing return address sticker inside. This way mothers of the children could look through the candy and know that certain candies were safe to give the kids.
This was in the days when a bunch of nuts were putting razor blades, needles in some candies and Ex-Lax in chocolate candies.
This made us a lot easier about allowing our kids to enjoy this rare time of all the candy they wanted to eat. Otherwise, I rarely allowed such things.