Pulaski Township Sgt. Chad Adams spent much of December and January in Amish attire.
The group agreed to lend the police women's bonnets, aprons and dresses to catch or scare away the suspect because they don't want their children to testify in court.
A female officer dressed as an Amish woman also worked with Adams.
Adams says police haven't been able to charge the man because of a lack of evidence, but believe he is the same person who was sentenced to house arrest in January for similar incidents in another county.
Adams revealed the investigation because the incidents have stopped.
