Inspect all candy before it is consumed, and let children know they are not to eat anything without the consent of a trusted adult.
Tell kids to not accept anything that is not commercially wrapped in factory-level packaging. For example, they should not eat fruit or homemade treats made by strangers.
Do not trust individual pieces of candy, like a single piece of gum or candy hand-tied in a clear baggie.
Tampering is rare, but closely examine all treats for any suspicious items or markings. When in doubt, throw it out.
Make sure items that can cause choking — like hard candies — are given only to those of an appropriate age.
Keep candles and lit jack-o'-lanterns away from landings and doorsteps were costumes could brush against the flame.