The Greece Central School District has put a sign language teacher on non-teaching assignment after a picture posted on Facebook showed her apparently putting a vulgar word on the smart board during class.

The photo was taken by a student -- allegedly snapped last year during a class at Greece Olympia High School. It shows the teacher from behind, standing in front of a smart board which displays a list of words. At the top is a vulgar expression.

The student's mother was offended when she saw the photo and posted it on Facebook because her daughter said it made her uncomfortable.

The district says it's investigating and the teacher won’t be working with students until the issue is resolved.