welcome back to "caught on camera." i'm contessa brewer. police have come to rely on video as an important law enforcement tool. the squads have dashboard cameras. bystanders have camcorders. and that video catches criminals in the act, helps prove cases in court. and then sometimes is used as training video to help prepare cops for the dangerous situations they'll face every day. the cameras can also catch cops behaving badly. police officers are expected to uphold the law. so, these images can be especially shocking. >> how old are you? >> in baltimore, maryland, a 14-year-old is skateboarding illegally and is confronted by a cop who doesn't like the boy's attitude. >> i'm not your father. you give that attitude to your father. you give it to me, i'll smack you upside the head. >> i don't have a father. >> shut your mouth. i'm talking. >> a friend captures the argument on a cell phone, as the officer becomes enraged because the boy, eric bush, calls him dude. >> give me that skateboard. >> the officer puts eric in a headlock and wrestles him to the ground. >> sit down.