Joel Best is the Professor of Sociology and Criminal Justice at University of Delaware. Joel's writing focuses on understanding how and why we become concerned with particular issues at particular moments in time–why we find ourselves worried about road rage one year, and identity theft a year or so later.
Warnings against tainted Halloween candy have been around for decades, but confirmed incidents are far and few in between.
My research stretches back to 1958. I have been unable to find any evidence that any child has been killed or seriously injured by a contaminated treat picked up in the course of trick-or-treating.