>Similar patterns abound nationwide, suggesting that Karma's career was not unusual. Lex, a drug detection dog in Illinois, alerted for narcotics 93 percent of the time during roadside sniffs, but was wrong in more than 40 percent of cases. Sella, a drug detection dog in Florida, gave false alerts 53 percent of the time. Bono, a drug detection dog in Virginia, incorrectly indicated the presence of drugs 74 percent of the time.

These are concerning false positive rates, but I don't think anything in the article suggests the extent of what the parent wrote, in a universal sense:

>They're basically a rubber-stamp. Dogs want to please their handlers. If the handler wants the dog to alert, the dog will alert. The presence or absence of drugs isn't relevant to the dog.