The New York City Police Department, always on the cutting edge of technology (your blogstress was among the first, one fine St. Patrick's Day, to be shackled by the Finest with plastic handcuffs), has plans to use something called a Long Range Acoustical Device (LRAD) as a means of crowd control.
A piece on ABCNews.com describes how LRAD is used by the military as a weapon:
When in weapon mode, LRAD blasts a tightly controlled stream of caustic sound that can be turned up to high enough levels to trigger nausea or possibly fainting.
Why say "Welcome to New York" with messy head-bashing, not to mention all that unsightly blood, when you can simply torture large crowds with a form of santized brutality?
In fairness, your cybertrix must note the the cops say they have no intention of using LRAD as a weapon. They just thought it would come in handy for giving orders to large crowds, they say. Your blogstress is all ears.
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Thanks to Professor Soundman, Jim Mastracco, for calling your Webwench's attention to this item.