There is no tolerance for this drug in food-producing livestock, and they and their by-products are condemned when it is detected.

FORBES: Over Public Outcry, Governor Signs Horse Slaughter Bill

The response of law enforcement at the time, Mr. Kennedy says, involved a number of strategies that, in the end, did not work very well: zero-tolerance task forces, gang sweeps, drug raids.

WSJ: Book Review: Don't Shoot