Hardin previously was charged with domestic violence and child endangering after Kettering police responded in August to a home on Ackerman Boulevard due to concerns of possible child abuse.
The charges were unrelated to his position at Fairborn High School. Hardin was placed on paid administrative leave pending an investigation at the end of August. As of Wednesday morning, he was still on paid administrative leave, according to school officials.
A message seeking comment from defense attorney John Paul Rion, who is representing Hardin, was not returned Wednesday.