Organizers of past protests in Houston were invited to Kenneth Madgison's office to learn more about what happens if the Department of Justice opens an investigation into the matter.
Protesters in Houston and cities across the nation have been calling for the government to file civil rights charges against Zimmerman.
Zimmerman was acquitted in the shooting death of Trayvon Martin.
Take ABC13 with you!
Download our free apps for iPhone, iPad and Android devices