I loathe FBI leadership. I support DJT defunding it.
However, some of their field offices still do good work. I am a major critic of law enforcement but I’d be remiss if I did not give credit where credit is due.
I agree with your desire for an independent review of this detective’s body cameral. I don’t share your faith in the field offices when the case is charged with Didn’t Earn It political poison. Reasonable people may at times disagree ...
As for the bureau itself ...
IMO ...
It should be utterly reformed from top to bottom. It should be made into a purely investigative organization, tasked with providing assistance to State and local police and Sheriffs and to the US Marshalls Service. It should not have “agents”; its personnel should not be armed, nor should they have power to arrest.