Violation of constitutional rights by local LEOs allows the Feds to get involved.
(c) As used in this section, the term
(1) Federal law enforcement officer means any officer, agent, or employee of the United States authorized by law or by a Government agency to engage in or supervise the prevention, detection, investigation, or prosecution of any violation of Federal criminal law;
http://www4.law.cornell.edu/uscode/html/uscode18/usc_sec_18_00000115----000-.html
Harness Bull is in Deeeeeep Shi'ite!