Police are not saying that monsters will definitely try to devour your children on Halloween. They are merely saying it is prudent to check the closet and look under the bed, just in case.
That is the logic of the warnings about marijuana edibles that law enforcement agencies reflexively issue this time of year: Even though it is highly implausible that strangers with candy would try to intoxicate costumed kids by replacing dime store snacks with pricey THC-laced treats, and even though there has never been a documented case of that actually happening, it is still possible. So when you inspect your children's trick-or-treat haul for other hypothetical hazards—as every responsible parent supposedly does—you should also be on the lookout for cannabis candy. And while you're at it, don't forget about the equally mythical threat that "rainbow fentanyl" poses to trick-or-treaters.
