One of my best friends has been a K9 cop for about 10 years. He trains the dogs, does all kinds of searches and tracks and attends and teaches many seminars.
The dogs are very accurate and work well. They go through a lot of training and certification in order to be used on the job. That said, a lot of it depends on the handler. If a handler is pressing the dog it could trigger a false positive. Most good handlers just let the dog do its thing and they reward the dog whether they find something or not.
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