People In Mercer County Are Concerned Over The Possibility Of A Methadone Clinic PRINCETON -- A recent drug sweep in Mercer County has people second-guessing the need for a methadone clinic in their county. Residents are worried about the misuse and abuse of prescription drugs being at these clinics. During the sweep, police found prescriptions of liquid methadone. They believe people are taking the liquid methadone from local treatment centers and using it for sale on the streets. Police caution that mixing liquid methadone with other illegal substances can be fatal and several overdoses have been reported this year. [continues 84 words]