Poisoned candy turns out to be a Halloween myth - St. Petersburg Times
The few cases that were thought to be genuine were either parents poisoning their own children, or kids getting into their folk's drug stashes.
You've heard the advice before: Check your kid's candy bucket after going trick-or-treating. Throw away any homemade goodies. Sometimes hospitals even offer to X-ray the candy just to make sure there isn't a needle in that Snickers bar.
This advice turns out to be the ultimate Halloween prank, a horror that has never happened, not once, in the history of Halloween, according to a researcher who has studied reports of Halloween mischief dating back to the 1950s.
"Deviants typically do bad things because they are greedy or they are angry," said Joel Best, a professor of sociology and criminal justice at the University of Delaware. "They don't just poison kids for the sheer fun of it."