Another defendant in a drug trafficking operation entered a guilty plea in Carbon County court on Tuesday.

David Allen Anthony, 28, of Lehighton, pleaded to one count of criminal conspiracy - possession with intent to deliver a controlled substance -heroin.Anthony was one of 11 defendants arrested in a drug trafficking ring labeled "Operation 93 Pipeline."Arrested with him were Erik Feliz, 23, of Hazleton; Matteo Puddu, Curtis Margle, Jason R. Will, and Brittany Michele Vincent, all of Carbon County; Joshua Ynoe Mejia, Bradesky Santos Jr., Anthony Jordan Vega, all of Luzerne County; Cynthia Ann Hippenstiel of Columbia County; and Robert Alan Fox of Bucks County.The state Attorney General's office, along with the Carbon County Drug Task Force, accused the 11 for their part in a drug trafficking operation allegedly responsible for distributing $1.5 million worth of heroin in Carbon County over a four-month period. The time frame for the operation was December 2014 to March 2015.The name given the operation was because authorities said the defendants would go to the Luzerne County area and get heroin then return to Carbon, using Route 93.Several other defendants in the case have pleaded guilty with some already sentenced and others awaiting sentencing.Judge Steven R. Serfass accepted the plea but deferred sentencing ordering the adult probation office prepare a presentence investigation report. It was noted Anthony recently completed a prison term in Blair County on unrelated charges.