My initial reaction was "nonsense!". Then I read the post by JMOR and I have to retract a bit. It sounds like a small, privately-held company looking to create some buzz in preparation for its IPO. Although it's certainly possible to make a device that will pinpoint the source of cell phone transmissions, that doesn't mean it would work in the real world, let alone be admissible in court.
Detecting active cell phones in traffic might be possible. Although it's true that phones are constantly talking back and forth with the cell towers, these are intermittent, low power transmissions. The nature of the transmissions is different when a voice call is active, and I think it would be feasible to identify a car where there's a voice call in progress. But detecting a text message is a whole 'nuther thing: The transmission is quite brief, only a millisecond or two. Any device detecting a text would have to be already homed in on the car at the instant the texter hit "send".
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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