J. Edgar Hoover, director of FBI agency, introduces FBI training facilities. This short film also shows how police and detectives gather evidence, and how the gathered evidence are used in a... Read allJ. Edgar Hoover, director of FBI agency, introduces FBI training facilities. This short film also shows how police and detectives gather evidence, and how the gathered evidence are used in a burglary case.J. Edgar Hoover, director of FBI agency, introduces FBI training facilities. This short film also shows how police and detectives gather evidence, and how the gathered evidence are used in a burglary case.