infuses. >> reporter: last year in canada, kids ended up in the emergency room after eating lollipops laced with synthetic marijuana. in los angeles, the lapd also warned about edible pot packaged to look just like candies kids are used to eating. what should a parent do? >> any candy that your child is going to get should be in a sealed professional commercial grade bag. it should not be -- they should not consume anything that is in a homemade bag, especially from a neighborhood or from a house that you are not familiar with. >> reporter: clayton sandell, abc news, denver. >> what would you give out? usually? >> what do i give out? i give out stuff that i like. like jolly ranchers. mike & ike's. twizzlers. >> there was once a man in our neighborhood who made candy apples. >> that's good. >> no, none of the parents -- this was in the '80s. the parents were very upset this man -- he was kind of the quiet neighbor.