New York state police say someone is sneaking onto dairy farms and contaminating unprocessed milk with antibiotics, rendering it unusable. Those responsible may also be giving antibiotics to healthy cows, which then produce contaminated milk, troopers said.

The contamination was discovered during testing at the Upstate Farms milk processing plant, troopers said. Only raw milk was affected, which was then destroyed. None of the contaminated milk was sent to stores or markets.
Investigators believe the antibiotics used to treat dairy cattle have been introduced directly into holding tanks in the dairy barns.

Authorities are investigating four incidents in Wyoming County dating back to November, including two in the past two weeks.

Associated Press