A substitute teacher at Northport High School was arrested late Monday and accused of having an inappropriate relationship with a student.

Police say Thomas Baudier, 22, of Northport, befriended a 16-year-old female student before kissing and having sexual contact with her on two occasions. School officials notified the Suffolk County Police Department, whose special victims unit conducted the investigation. Police arrested Baudier at his Valley Road home without incident.

Baudier is charged with third-degree sexual abuse and endangering the welfare of a child. He was released on $5,000 bond.