Explosive- and drug-sniffing dog performance is affected by their handlers' beliefs

Drug- and explosives-sniffing dog/handler teams' performance is affected by human handlers' beliefs, possibly in response to subtle, unintentional handler cues, a new study has found. The study found that detection-dog/handler teams erroneously "alerted," or identified a scent, when there was no scent present more than 200 times -- particularly when the handler believed that there was scent present.

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