The Secret Service intervened in an investigation into a 2018 incident involving Hunter Biden and his girlfriend at the time and former sister-in-law, Hallie, in which she took his gun and tossed it into the trash, according to a report. When she returned to retrieve the gun, it was gone, Politico reported on Thursday. Police in Delaware launched an investigation in case the gun, left in a trash can across from a high school, had been used in a crime, the report said.