India, May 1 -- Michelle Mercogliano, a 35-year-old teacher from Chester County, is in custody for allegedy having sex with a 16-year-old student.

On Wednesday, authorities charged the Conestoga High School special education teacher with 63 criminal counts, including institutional sexual assault, corruption of minors, and illegal drug distribution.

The investigation began on Monday after the juvenile student's family reached out to law enforcement. The teen alleged that he and Mercogliano had sex approximately 12 times since February, with many of those allegedly taking place at Mercogliano's parents' home in Malvern, per Tredyffrin Township police report.

The criminal complaint also claims Mercogliano provided the student with medical...