Jeffrey Vincent was released Thursday on the condition that he not have any contact with the victim.
Vincent still faces criminal charges, even though the victim is 18, and able to give consent.
Klamath County District Attorney Eve Costello said, “It is considered official misconduct for a teacher to engage in a relationship with a student, even if they are 18.”
Police said Vincent threatened to end scholarships for the victim if she told school authorities about their relationship.
Vincent is currently on administrative leave from the Klamath County School District.