On October 20, 2016, Delaware County, Pennsylvania, District Attorney John Whelan said in a one-paragraph statement  that there was "insufficient evidence" to proceed with prosecution and that the charge against Nagl was being dropped. The Philadelphia Inquirer reported  that according to court documents, Nagl had found marijuana in his son's backpack and, as punishment, had confiscated the marijuana and the boy's cellphone. Two days later he discovered the items missing from where he had hidden them, the documents said, and found his son using the phone in a bathroom in the family home. When he attempted to take back the phone, the son refused to hand it over; when Nagl took the phone from his son's hands, the boy "re-engaged in a physical altercation" so Nagl "put his son in a choke hold to end the altercation quickly," according to the documents. Nagl's attorney, Robert Keller, told the Inquirer that "the facts showed that the parent took appropriate steps to discipline a child who was acting inappropriately" and that Nagl was "hoping to return [as headmaster] as quickly as possible." He was re-instated later that week, and continues his work as headmaster.