ATF: Bureau of Alcohol, Tobacco, Firearms, and Explosives
Criminal Justice Profiles: Career and Job Search Guide
FBI: Federal Bureau of Investigation
Federal Bureau of Investigation (Reports and Publications) Includes Uniform Crime Reports
NACJD: National Archive of Criminal Justice Data
National Criminal Justice Reference Service
National Drug Intelligence Center Achive
Supreme Court of the United States
Always evaluate your sources - what Google considers to be scholarly may not be considered scholarly by your professor.