A former high school teacher charged with 16 counts of sexual battery involving male students in southwest Ohio was taken advantage of by the teens because of an impairment that made her unable to protect herself, her defense team said Wednesday.

Attorneys for Stacy Schuler, 33, of Springboro, also this week changed her not-guilty plea to not guilty by reason of insanity.

Schuler resigned as health and gym teacher at Mason High School in February after her arrest earlier this year. She was charged with 16 counts of sexual battery allegedly involving several teenage boys and three counts of providing alcohol to minors.