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which may explain why more police officers now favor wearing a body camera. in dallas last june an officer was wearing one when he and his partner shot and killed a mentally ill man with a screwdriver. >> drop that for me. >> jay! >> drop it. >> oh you killed my child! oh they killed my child. >> reporter: officer say the man lunged and shot him five times. this shows the officer's side of the story instead of a stranger's cell phone. which may not capture an event from the very beginning. even dash cam video in this case may not have been enough to prove the officers acted appropriately since their cars were parked in the street. the officers are still working, awaiting word from the dallas county district attorney. so next time a police officer is caught on cell phone video doing something like this -- >> are you going to open the door? >> why don't you say somebody people are shot by the police?

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