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MARLBORO, Massachusetts ( WBZ ) -- A Massachusetts dentist is facing charges after investigators said he hid a camera in the staff bathroom at his office in Marlboro.

According to the Middlesex District Attorney, a dental assistant at the New England Dental Group found a camera taped to the toilet in the staff bathroom back in May. The assistant allegedly reported the camera to Dr. Patrick Tu Huynh, 35, who removed the camera and told the assistant he would look for who did it.

Three months later, on Aug. 14, the DA said the same dental assistant found an identical camera in the same bathroom, attached to the toilet with dental wax and medical tape. This time, the dental assistant called the police.

The DA said Huynh placed the camera in the toile

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