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Study: Drug Dogs Are Four-Legged Magic Lamps of Probable Cause


A study of drug dogs has confirmed what we in the criminal defense bar have known for a long time — that drug dogs are the equivalent of dowsing rods for drugs.

Or, in the words of Auburn University prof Lawrence Myers, a “search warrant on a leash.”

Of course, if you’ve ever been the victim of a drug dog-induced search, you probably already suspected this.

In 2010, a team of researchers at the University of California, Davis set out to test the reliability of drug- and bomb-sniffing dogs.

Here are the details of that study:

The team assembled 18 police dogs and their handlers and gave them a routine task: go through a room and sniff out the drugs and explosives.

But there was a twist. The room was clean. No drugs, no explosives.

In order to pass the test, the handlers and their dogs had to go through the room and detect nothing.

But of 144 runs, that happened only 21 times, for a failure rate of 85 percent.

Although drug-sniffing dogs are supposed to find drugs on their own, the researchers concluded that they were influenced by their handlers, and that’s what led to such a high failure rate.

So 85% of the time when the dogs were taken through rooms with no drugs, they would indicate that drugs were present. In the field when a canine indicates that drugs are present (say, for example, in a car) then that automatically gives the police probable cause to search the car for drugs.

The study itself is actually from 2010, but is at the center of a new lawsuit filed by Nevada Highway Patrol troopers who allege that the use of the dogs is a blatant violation of constitutional rights.

In everyday use, though, when drug dogs indicate and no drugs are found after the police ransack your car looking for drugs the stock explanation is that the dog’s nose is so sensitive that it is detecting drugs that used to be in your car. Yeah, right:

Although there should have been no alerts in any of the rooms, there were alerts in all rooms. Moreover, there were more alerts at the locations indicated by construction paper than at either of the locations containing just the decoy scents or at any other locations.

That is significant, Lit said, because there were more alerts on target locations indicated by human suggestion — the construction paper — than at locations of increased dog interest — the hidden sausage and tennis balls. There also were alerts on a wide variety of other locations, indicating that the dogs were not simply alerting in the same locations where other dogs had done so.

Lit noted that in the early 20th century in Germany a horse named Clever Hans was believed to be capable of counting and other tasks. It was determined that Clever Hans actually was responding to the minute, postural and facial cues of his trainer or other observers. Similarly, detection dogs may be alerted to subtle human cues that direct dog responses without formal training, including pointing, nodding, head-turning and gazing.

In other words, drug dogs are walking probable cause.

Filed Under: News

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Tucker is good at what he does and it shows. I couldn’t ask for a better lawyer. He treated me more like a friend than just another client. Money well spent. I would recommend him to anyone in search of a criminal defense lawyer. I asked around who was the best lawyer in town, I was told Baldani Law Group…

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Tucker Richardson worked really hard for me and did not give up during the arraignment for my second Alcohol Intoxication charge to prove there was no probable cause for my arrest. His effort and persistence ultimately led to the judge not wanting to send my case to trial and the charge of AI against me was dismissed…

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If you are here reading reviews in hopes of finding a law firm that can help you and get you the best results possible, THIS IS THE FIRM YOU MUST CHOOSE! We hired Tucker a couple months back, the state was trying to void my probation an my future at freedom was at great risk.

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