NPR's Margot Adler reports that an industry is springing from the premise that teenagers are dangerous. There are gadgets that beep if your teen drives over the speed limit; machines to prevent your car from starting if the driver has alcohol on his breath; hair analysis kits that will let you perform drug tests on your kids. All of these products of parents' fears are invasive, and a few may be unconstitutional, but they're proliferating.
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