On April 23, 2007, the FBI heard that Hahn may have a second breeder reactor in his freezer. The FBI contacted him via telephone. Hahn said that he did not have any radioactive material. The FBI decided he was not a terrorist threat. However, they decided to do a personal interview. During a May 16, 2007 interview at an FBI office, investigators asked Hahn about flyers that he had sent out promoting his book and upcoming film. They also asked about him stealing tires and rims from a vehicle before he joined Navy service. They also asked him about a diagnosis of paranoid schizophrenia. FBI agents then interviewed a person (whose name was not given) who said that Hahn was using cocaine a lot. They also said he was not taking his prescribed medication, and that he was paranoid of people that he claimed "had the ability to 'shock' his genitals with their minds". They also said he had possibly been visited by prostitutes. The person also said that he believed that Hahn was still trying to build a reactor, and that Hahn was collecting radium. He said that he did not believe Hahn wanted to hurt anyone, but was worried for his mental health.