You're obviously not too high on the intelligence or the knowledge
scale,there Elliott.The "transmitters"(readers),are attached to the
buildings of the stores that use that theft prevention system,and they read
the magnetic strips as you try to sneak out of the place with something you
didn't pay for.
to peel them off the back of cd's for example and put them on the floor
stick side up. It worked really well when they had a carpet rug or
something to hide them next to. We would hang out and wait until someone
finally stepped on it and it stuck to the bottom of their shoe and then set
off the alarm going out the door.
I think what Elliot is referring to is an RF chip. They actually send a
signal out. Depending on what is flashed on the chip. Mostly there used to
transmit the bar code of the item. Wal-Mart is experimenting with these is
stores, they are looking to be able to push a shopping cart through a halo
scanner and it would ring up your entire sale. No more slow ass cashiers
with an attitude.
We use them in the plant to track manufactured items through out the
Yes that's what I was referring to for walmart. Also,
wether you know it or not there are technologies to
read the signals that move around inside of a computer.
These technologies have been around for a long time.
The government even requires some equipment to pass
"TEMPEST" specifications for the radiated emission
levels in order to prevent eavesdropping (see
http://www.eskimo.com/~joelm/tempest.html ). To enable
a transmit w/o a conpicuous antenna is not difficult,
and can even be added/installed without revealing
it's presence to the original designer. And even
my cell phone has no visible antenna.
So unless you test the box extensively in an EMI
lab, and carefully control the production line (ie:
prevent part substitution - a substitute part could
include a transmitter) - there is NO WAY you could
possibly know for sure that the box doesn't transmit.
I heard they actually record information which can be used for
diagnosis or for accidents, kind of like on airplanes.
They supossedly record things like speed, ABS brake usage, whether the
seat belt is engaged, air bag deployment, and such.
1987 Z75 Sub (the old off road package was order #Z75)
2003 Z71 Sub (new is nice but don't scratch it)
A fellow from Montreal went to jail for reckless driving which resulted in
an accident possibly causing fatalities. Not sure about witnesses so google
search the Montreal papers for details
Data gleaned from his former (written off) vehicle's airbag computer was
used in court to convict him.
Data stored there in belonged to the present owner, yup you guessed it, his
That is what black boxes can do.
It works both ways of course helping you win your case in court if wrongly
accused or sued.
Ethical issues such as privacy etc will be more frequently breached as we
run head long to embrace technology!
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