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Below is an excerpt, but basically states that dogs are looking to please the handlers, and will often alert if they think the handler is looking for an alert, or can easily be trained to alert base on other queues from the handler. Rest of the article is about how cops will illegally seize property based on dog alerts or other reasoning from out of state drivers, simply to auction it off.
Good read.
I for one am not surprised.
"...The problem isn't that the dogs aren't capable of picking up the scent, it's that dogs have been bred to please and interact with humans. A dog can easily be manipulated to alert whenever needed. But even with conscientious cops, a dog without the proper training may pick up on its handler's body language and alert whenever it detects its handler is suspicious.
In one study published last year in the journal Animal Cognition, researchers rigged some tests designed to fool dogs into falsely alerting and others designed to trick handlers into thinking a package contained narcotics (it didn't). Of the 144 total searches performed, the dogs falsely alerted 123 times. More interesting, the dogs were twice as likely to falsely alert to packages designed to trick their handlers than those designed to trick the dogs.
In 2011, the Chicago Tribune published a review of drug dog searches conducted over three years by police departments in the Chicago suburbs. The paper found that just 44 percent of dog "alerts" led to the discovery of actual contraband. Interestingly, for Hispanic drivers the success rate dipped to 27 percent, again supporting the theory that drug dogs tend to confirm the suspicions (and, consequently, the biases) of their handlers.
A 2006 statistical analysis (PDF) of police dog tests by University of North Carolina law professor Richard Myers concluded that the dogs aren't reliable enough to provide probable cause for a search..."
Below is an excerpt, but basically states that dogs are looking to please the handlers, and will often alert if they think the handler is looking for an alert, or can easily be trained to alert base on other queues from the handler. Rest of the article is about how cops will illegally seize property based on dog alerts or other reasoning from out of state drivers, simply to auction it off.
Good read.
I for one am not surprised.
"...The problem isn't that the dogs aren't capable of picking up the scent, it's that dogs have been bred to please and interact with humans. A dog can easily be manipulated to alert whenever needed. But even with conscientious cops, a dog without the proper training may pick up on its handler's body language and alert whenever it detects its handler is suspicious.
In one study published last year in the journal Animal Cognition, researchers rigged some tests designed to fool dogs into falsely alerting and others designed to trick handlers into thinking a package contained narcotics (it didn't). Of the 144 total searches performed, the dogs falsely alerted 123 times. More interesting, the dogs were twice as likely to falsely alert to packages designed to trick their handlers than those designed to trick the dogs.
In 2011, the Chicago Tribune published a review of drug dog searches conducted over three years by police departments in the Chicago suburbs. The paper found that just 44 percent of dog "alerts" led to the discovery of actual contraband. Interestingly, for Hispanic drivers the success rate dipped to 27 percent, again supporting the theory that drug dogs tend to confirm the suspicions (and, consequently, the biases) of their handlers.
A 2006 statistical analysis (PDF) of police dog tests by University of North Carolina law professor Richard Myers concluded that the dogs aren't reliable enough to provide probable cause for a search..."
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