There is nothing scientific about it. They don't present the dogs when something isn't found. They don't provide a record of how frequently something was/wasn

There is nothing scientific about it. They don't present the dogs when something isn't found. They don't provide a record of how frequently something was/wasn't found when a dog alerted. They just classify it differently when the dog was wrong, "trace presence of drugs was indicated by the dog". Instead of, "the dog was wrong" and is wrong x% of the time.