Investigation: Hotel Security and Violent Takedowns

The surveillance video doesn't have audio, but it's easy to see that John Binns is upset with the staff at Harrah's Resort in Atlantic City. But after hotel security gets involved - forcefully - with him and his wife and daughter, the situation escalates physically.

The video above is one example of what some customers said was overly aggressive physical abuse by Harrah's security. Harrah's declined to comment on specific cases but said, its security personnel "are trained to use the least amount of force required to manage any particular incident while ensuring they are taking necessary steps to protect guests, employees and themselves."

Tune in for more in the full ABC News investigation Friday on "20/20?.

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