Officially and legally, if one is in the United States one can watch episodes of Cops online on Fox's offical website (if you have the correct tv providers), or via Hula (for up to 28 days after airing). The official Cops website has some videos but I'm not sure if they're full episodes.
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You can watch some full episodes on nick.com. There's usually at least three or four episodes on TV every day.
you can watch full episodes for free at fancast. com or youtube.com
citv
you tube
You can watch it on TLC The Learning Channel