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 n.— «As they talk, the flashlight—this is no ordinary flashlight—is on the job. It is a little-known device that surreptitiously traps a sample of a motorist’s breath and tests for the presence of alcohol. Commonly called “sniffers,” they are used by some law enforcement agencies in the central San Joaquin Valley.» —“Sniffing out crime” by Tim Eberly Fresno Bee (California) Dec. 31, 2006. (source: Double-Tongued Dictionary)

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Further reading

Highway Robbery (episode #1626)

Secret signals on the job: Waitresses at some 19th-century restaurants ensured speedy drink service by communicating with a non-verbal code. One server took orders, then placed each customer’s cup to indicate exactly what the customer wanted...