Incorrect. In California I am a licensed security guard so I do have a clue. I took a mandatory state course called Power to Arrest which outlined specifics of MY authority to arrest. My authority is actually no different than that of a citizen making an arrest which is legal in California you nincompoop. The real difference is as a security hired by a business I am acting as an agent on behalf of that business and thus private property laws come into effect. Think of it as you defending your own house and property Adam, because that's essentially what it is. You'd probably defend Joe Horn but not Walmarts right to protect its property?
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Actually, Walmart is going to be screwed out of millions and these two guys will be fired, and most likely arrested too. The problem stems with assault back. These guys could of videotaped the incident, the car, everything and could of used pepper spray. Instead, they went after the 'thief' in a brutal way, who regardless is innocent until proven guilty.
They are in trouble because their is a video showing the attacks before and after. Yes, they can claim he stabbed them, but he can claim he was defending themselves against people who have no badges and more.
California does have a 'citizen right to arrest' someone but as I was clearly told, if you are going to do that, you better be prepared for the consequences too.
A simple video tape showing the person would of sufficed. Instead, him stealing $30 worth of products is going to cost them a lot more (millions). You want to stop theft. Videotape, post the pics and the video, and make everyone know this scumbag stole. Make it a lot easier for the police to do their job.