maybe they didnt have anything in your car.
http://www.newscientist.com/article/dn13513
Quote:
A word in your ear
Some of the technologies are conceptual, such as an electromagnetic pulse that causes a seizure like those experienced by people with epilepsy. Other ideas, like a microwave gun to "beam" words directly into people's ears, have been tested. It is claimed that the so-called "Frey Effect" - using close-range microwaves to produce audible sounds in a person's ears - has been used to project the spoken numbers 1 to 10 across a lab to volunteers'.
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