Damian Dovarganes,File, Associated Press
In this Jan. 15, 2014 file photo a Los Angeles Police officer wears an on-body camera during a demonstration for media in Los Angeles. Nearly three dozen advocacy groups have released principles they want police agencies to follow when adopting body cameras. The groups say the five “civil rights principles” released Friday, May 15 would help ensure the cameras provide public accountability and transparency. Groups include the American Civil Liberties Union, chapters of Asian Americans Advancing Justice and Urbana Champaign Independent Media Center.

LOS ANGELES — Nearly three dozen advocacy groups proposed on Friday several rules they want police agencies to follow when they adopt the use of body cameras.

The groups, which include the American Civil Liberties Union and chapters of Asian Americans Advancing Justice, say the so-called "civil rights principles" would help ensure that the cameras provide accountability and transparency to the public.

The groups suggest that police develop their camera policies in public with input from community members and to consult with the public on any further changes. They say footage should be released with appropriate privacy safeguards. And they note that police officers should be prohibited from viewing footage before filing their reports.

"Footage of an event presents a partial — and sometimes misleading — perspective of how events unfolded," they wrote. "Pre-report viewing could cause an officer to conform the report to what the video appears to show, rather than what the officer actually saw."

As police departments across the country adopt body cameras, their policies have frequently lagged behind and received less scrutiny than the technology itself.

Civil liberties groups have pushed back against the Los Angeles Police Department's recently-adopted body camera policy, which didn't include many of these principles.

Tami Abdollah can be reached at http://www.twitter.com/latams.