 He believed that a lack of funding had affected operations and that Lab technicians had a pro-prosecution bias.He suggested they were FBI agents first and forensic scientists second, due to the institutional culture of the Bureau, which resulted in the tainting of evidence.From September 1934 to September 1975, the Lab was located on the 6th floor and the attic of the Justice Department Building in Washington, D.C. Public tours of the lab work area were available until the FBI moved across the street to the newly constructed J. Edgar Hoover Building in 1974.