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"While breathalyzers already exist to test for impaired driving, they can only detect alcohol consumption, overlooking the possibility that someone has taken drugs. A 13 year old boy from Texas, Krishna Reddy, discovered a way to solve this problem by designing a device that measures potential drivers&amp;#039; pupil dilation. The device uses a camera, toilet paper roll and flashlight. It functions by shining a flashlight, directing it into someone&amp;#039;s pupil with the toilet paper roll, all while a camera records the pupil&amp;#039;s movement. This movement is then analyzed using an app that measures the size of constriction. It not only detects alcohol, marijuana and amphetamines, but boasts an intelligent design that doesn&amp;#039;t necessarily require a person&amp;#039;s consent. The future development of this test for impaired driving could even be integrated into a rear-view mirror in order to start a car."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.trendhunter.com/trends/impaired-driving>