A woman accused of selling dozens of bags of fentanyl-laced heroin to an undercover vice officer in Butler is being held in the Allegheny County Jail.

State police said authorities in Allegheny County on Tuesday arrested Brandi Nicole Berry, 35, of Butler, who was wanted on a pair of felony arrest warrants.

District Judge William Fullerton on Thursday issued the warrants that allege Berry made a pair of hand-to-hand drug deals to an undercover officer last year.

She sold 48 stamp bags of heroin for $300 during a Sept. 14 deal on Virginia Avenue, according to court documents. Lab tests subsequently revealed the bags contained a combined 2.02 grams of heroin as well as fentanyl.

Fentanyl is a synthetic opioid painkiller that is similar to morphine but 50 to 100 times more powerful, drug abuse experts say.

Berry three weeks later sold 30 bags of heroin for $210. That deal Oct. 5 played out on Wagner Avenue. The bags, documents said, contained 0.72 grams of heroin along with fentanyl.

Berry was arraigned Tuesday on two counts each of possession with intent to deliver and possession of a controlled substance and drug paraphernalia.

She remains in the Allegheny County Jail on $20,000 bail, pending her commitment to the Butler County Prison.