no its not true There have been at least two confirmed deaths linked to tainted Halloween candy, but strangers didn't cause them. In a 1970 case, family members sprinkled a 5-year-old child's candy with heroin to hide the fact that he'd gotten into his uncle's drug stash. In the other case, which occurred in 1974, a man named Ronald Clark O'Bryan of Houston, Texas, laced his son's candy with cyanide and the child died. The motive was a big insurance policy that O'Bryan had taken out on his son. To make the poisoning appear random, O'Bryan also poisoned his daughter's candy and the candy of three other children. None of them ate it, however. He was eventually convicted of murder and died by lethal injection. Although these were isolated incidents, the idea of candy tampering spread through cities and suburban neighborhoods, making parents fearful about the contents of their children's Halloween baskets. The candy-tampering scare reached its height in 1982, when seven people in the Chicago area died after taking tainted cyanide-laced Tylenol capsules. About 40 communities actually went so far as to ban trick-or-treating. That year, the candy industry set up a telephone hotline to collect police reports of candy tampering, but it hasn't received a single verified report of a child being seriously hurt by tainted candy from a stranger. use caution anyway ! check this site;http://home.howstuffworks.com/candy-tampering.htm

My favorite when I was a wee lad was the razors the were hidden in apples scare. It is possible that this was just kids sick of getting fruit on Halloween.