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[liberationtech] LRAD counter-measures?

Chris Csikszentmihalyi robotic at
Sun Dec 14 17:35:10 PST 2014

Hi Jay,

Haven't worked on the LRAD yet, but one of my graduate students did build
what I think is the world's first Taser detector.  It looked like a broach
and could be worn on your lapel or shirt pocket. Tasers generate AM waves
all over the spectrum, but the jolts are modulated and it was fairly easy
to pull out that specific signal.  It had bluetooth and a nice phone app
that measured how many times and for how long you were tased and,
optionally, could make an outgoing call to your mom or the ACLU.

curl >

It worked like a charm but in the end he kept the ham hock around for too
long in the grad student cube fridge and got food poisoning... you just
can't win.


On Sun, Dec 14, 2014 at 3:05 PM, Jay Cassano <jay at> wrote:
> Hi Lib-Tech,
> I'm a freelance journalist covering the intersection of tech and politics.
> I'm wondering if any lib-techers know of or have experimented with ways to
> disable or reduce the sound from the long-rage acoustic devices that the
> NYPD has been deploying lately. LRADs were also used during Occupy.
> You know, maybe something like this? ;) (I know it
> doesn't quite work that way...)
> Protesters have been talking about the use of LRADs for a while now, but
> the Times just picked up on it in the recent #BlackLivesMatter/#ThisStopsToday
> protests:
> concerns-over-shrill-device-used-by-police-during-garner-protests.html?
> If anyone knows of attempts to build such counter-measures or has ideas
> for how one might be built, please feel free to reply to me off-list.
> Thanks,
> Jay
> --
> Jay Cassano
> Freelance Journalist and Editor
> Senior Writer, Fast Company
> Technology Correspondent, Waging Nonviolence
> @jcassano
> --
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Chris Csikszentmihályi
ERA Chair & Scientific Director
Professor   [image: m-itiLogo] <>
------------------------------ | csik at | <>
* "Art means… to resist the course of a world that unceasingly holds a gun
to mankind's chest."

--Theodore Adorno*
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