(Salem, OR) -- A Salem teacher is facing a lawsuit accusing him of grooming and other misconduct. The Salem-Keizer School District says Joshua Rist of McNary High School is on administrative leave due to the lawsuit filed by two former students. The lawsuit comes after four investigations by different agencies failed to bring charges against Rist due to insufficient evidence. School District Superintendent Andrea Castaneda says details in the lawsuit are concerning. She says Rist tried to advance deep relationships with students that would continue after they left school and that that's ethically and morally unacceptable. A third allegation is under investigation.