Police body camera video can provide a full recording of any interaction an officer has with a member of the public, according to security experts.

Eight states have laws making police body cameras mandatory. Massachusetts isn't one of them.

In fact, WBZ-TV's I-Team found that less than half of Massachusetts law enforcement agencies have applied for state money to buy the cameras.

Police security experts believe body camera video provides a unique perspective of incidents.

"They paint a very sympathetic picture of the police action. You can really get a granular look at what that officer was being faced with at that particular point in time," said WBZ News Security Analyst Ed Davis, a former Boston Police Commissioner. "Frankly, I think it helps police."

A state grant program ha

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