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INDIANAPOLIS, Ind. (April 11, 2016)- A local pain doctor, who has several practices across central Indiana, was arrested Monday for allegedly exchanging controlled substances for sex.

Dr. Tristan Stonger began treating a female patient in 2013 and developed a sexual relationship with her sometime in late 2014, according to court documents. The patient told investigators she complied with the sexual demands, because she feared Dr. Stonger would stop writing her prescriptions.

On March 28, the female patient visited the doctor at the office and recorded the encounter. Within minutes of the appointment, the doctor can allegedly be heard asking the female patient to perform a sex act on him. Court documents reveal that Dr. Stonger allegedly wrote three prescriptions for controlled substances at the end of the visit.

A review of the Indiana prescription drug monitoring database, INSPECT, shows the female patient has filled 13 prescriptions in 2016 for Adderall, Lyrica, Oxycodone and acetaminophen. All of the prescriptions were written by Dr. Stonger, according to court records.

On February 25, 2016, a former employee filed a complaint. The complaint raised concerns of Dr. Stonger engaging in sexual activities with patients. Federal investigators interviewed the employee and she revealed that Dr. Stonger had "special patients" who would spend unusually long periods of time with the doctor. When Dr. Stonger was with these "special patients" he would allegedly tell his staff to knock before entering the exam room. The complaint also pointed out that it appeared these "special patients" were receiving more prescriptions than other patients.

In February, the DEA raided Dr. Stonger's offices in Indianapolis, Peru and Bloomington for unrelated accusations. He was being investigated at the time for alleged over-prescribing that led to the deaths of several patients. Sources confirm that case is still pending and charges could be filed.

The Indiana Attorney General has filed a motion to suspend Dr. Stonger's license. The medical licensing board will hear that motion at its regularly scheduled meeting on April 14.

Marion County Prosecutor Terry Curry and Indiana Attorney General Greg Zoeller will hold a press conference Tuesday at 10:30 a.m. in relation to this investigation.

Sign outside of Dr. Stonger's office reads "Clinic has been shut down" pic.twitter.com/q473qShRRl — Charlie De Mar (@CharlieDeMar) April 11, 2016