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Davis. nonviolent protesters sitting on the ground. their arms linked in a show of unity. and campus police officers spraying pepper spray, essentially pointblank, directly into their faces. the protesters do not fight back. 11 protesters were treated for injuries. two had to be hospitalized. an investigation into the incident is under way and the school's chancellor is facing intense pressure over her supervision of the school's police department. in new york, where the occupy wall street protests began two months ago, pepper spray has been one of the nonlethal weapons of choice for police. r...

By now you've probably seen this video shot friday at the university of california at davis. nonviolent protesters sitting on the ground. their arms linked in a show of unity. and campus police officers spraying pepper spray, essentially pointblank, directly into their faces. the protesters do not fight back. 11 protesters were treated for injuries. two had to be hospitalized. an investigation into the incident is under way and the school's chancellor is facing intense pressure over her supervision of the school's police department. in new york, where the occupy wall street protests began two ...

Essentially pointblank, directly into their faces. the protesters do not fight back. 11 protesters were treated for injuries. two had to be hospitalized. an investigation into the incident is under way and the school's chancellor is facing intense pressure over her supervision of the school's police department. in new york, where the occupy wall street protests began two months ago, pepper spray has been one of the nonlethal weapons of choice for police. recently we've been hearing unconfirmed reports of something else, too. we heard about it in oakland as well. it's something called an lrad, ...

1990's. >> it's the ipod. you had the jonas brothers on the show the other day. i'd rather watch them on tv. people have the ipods plugged into their brain. literally if you have more than 85 decibels for more than eight hours, you'll get hearing damage. one out of six kids were found to have hearing damage in 2005. that's a very large number. >> no kids should use ipods? >> no, look, i think it's adequate. when a family tells you, turn offer the computer, lower the volume where you can hear it normally, those are the issues so you want to pay attention. limited exposure is the way to go and, ...

Preemptively try to get ahold of this before the crowd shows up. i know there's been a challenge to a controversial crowd device they wanted to use. what happened there? >> reporter: that is the lrad, long range acoustic device or sound canon. it can be used as a public address system or sound canon producing ear-splitting levels of sound. the court has just ruled because it had the ability to produce long-term hearing damage, the judge has just ruled that the police can use this device as a public address, but if they want to use that sound canon or alert function, the police have now been re...