http://deepblue.lib.umich.edu/bitstream/2027.42/109703/1/TylenolMurders_Markel.pdfDescription of TylenolMurders_Markel.pdf : In 1983, the U.S. Congress passed what was called 'the Tylenol bill,' making it a federal offense to tamper with consumer products. In 1989, the FDA established federal guidelines for manufacturers to make such products tamper-proof.
