WILLIAMSPORT, Pa. (AP) – A Pennsylvania woman is facing charges that she sold food stamps for heroin, after she tried to sell the food stamps online for cash.

Lycoming County authorities filed charges this week against 37-year-old Tanya Keenan-Mack. Court records show Keenan-Mack is in jail stemming from an unrelated probation violation in a forgery case.

READ MORE: Uncertainty Surrounds New Omicron Variant: 'We Don't Have Answers Yet'

The state inspector general’s office says Keenan-Mack exchanged $194 in food stamps on an electronic benefits card for heroin, and that the card was used at a Weis Markets and a Walmart last month.

Join The Conversation On The KDKA Facebook Page
Stay Up To Date, Follow KDKA On Twitter

READ MORE: 2 Injured After Stabbing In Pittsburgh's Arlington Heights Neighborhood

The office says it began investigating after receiving a tip Feb. 6 that Keenan-Mack had posted an ad on Facebook’s “Williamsport New and Used, Buy and Sell” page, offering $194 in food stamps for $100.

A public defender for Keenan-Mack didn’t immediately return a call seeking comment.

MORE NEWS: Labor Secretary Marty Walsh Says Build Back Better Will Help Retrain Workers For Pittsburgh's Jobs Of The Future

(Copyright 2017 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)