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A federal agent was arrested Tuesday for taking pictures in the women’s restroom of a UW-Madison residence hall, the university’s police department said.

Justin T. Fahy, of Monona, allegedly went into a bathroom at Witte Residence Hall, 615 W. Johnson St., on Friday afternoon, put his cell phone under an occupied stall and took pictures, police said. The 27-year-old Fahy, who identified himself as a special agent for the federal Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), told police it was a misunderstanding and that he mistakenly entered the wrong restroom, said UW police spokesman Marc Lovicott.

Ashlee Sherrill, a spokeswoman for the ATF’s St. Paul Field Division, confirmed Fahy is employed at the bureau.

Police obtained a search warrant for Fahy’s phone and reviewed security cameras from inside the residence. Lovicott said police determined he had been in the first-floor restroom for at least 14 minutes.

“In addition, Fahy’s phone had been recently restored to a backup point from earlier this year, leading UWPD investigators to believe he was likely trying to delete evidence,” Lovicott said.