Oklahoma City police officers soon will begin wearing body cameras, devices widely seen as providing truth when differing accounts emerge of controversial encounters with people.

The police department will begin a 100-camera pilot program, joining dozens of major cities that have begun trying out cameras since the killing in Ferguson, Mo., of a young black man by a white officer.

The August shooting in suburban St. Louis prompted rioting and accusations of excessive force. More unrest followed November’s announcement that a grand jury declined to indict the officer.

“We know video cameras will do nothing but tell the truth,” Ajani Khalid, an advocate for issuing cameras to officers, told the Oklahoma City Council earlier this month.