YORK, Pa. (AP) -- A special education teacher in central Pennsylvania is on administrative leave after being charged with heroin trafficking charge. Thirty-nine-year-old Megan Butler Warner of York is facing a felony charge of possession with intent to deliver. The charge stems from a Jan. 19 traffic stop in Spring Township, Berks County, where police say they found nearly $1,000 worth of heroin in Warner's car. Warner is a teacher at Helen Thackston Charter School in York. The school board said Thursday that Warner will remain on leave pending an investigation. A preliminary hearing is set for May 20. It's not known if Warner has retained an attorney. Spring Township police Chief Bryan Ross said investigators don't have a reason to believe Warner was doing anything improper at the school.