Officer Joshua Johnson, 22nd Security Forces Squadron patrolman, demonstrates the use of the Passive Alcohol Sensor IV on a common access card April 28, 2010, McConnell Air Force Base, Kan. The PAS IV senses the alcohol through small silent pump located near the mouth of the light that draws an air sample when a person speaks. (U.S. Air Force photo/Senior Airman Abigail Klein)
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