Every year about 20,000 people are killed on American roads by drunken drivers. Now several firms are promoting a product that could save some of those lives: disposable alcohol detectors designed for use by consumers. One device, called BreathScan and manufactured by Denver-based Prescott Technologies, is a 3-in. tube filled with yellow crystals. A motorist blows into the tube and if the crystals turn blue-green, knows that he is too intoxicated to drive safely. Such gadgets were invented years ago but have been sold almost exclusively to police departments and other institutions. Within a month, though, Prescott Technologies plans to sell...
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