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Well from Wikipedia it's defined as follows: "test sensitivity is the ability of a test to correctly identify those with the disease (true positive rate), whereas test specificity is the ability of the test to correctly identify those without the disease (true negative rate)." I remember reading that most of the dogs in US airports are actually sniffing for bomb-making chemicals and not drugs. It depends where in the airport you are at. At TSA, when going through security before departure they are explosive sniffing dogs. But at custom, when re-entering the country from overseas they are drug-sniffing dogs. Then also, some airports let local police come walk around more or less anywhere passengers are.

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