Dogs Often Give Police False Alarms 
Drug-sniffing dogs can give police probable cause to root through cars, but the dogs have been wrong more often than they have been right about whether vehicles contain drugs or paraphernalia, reports the Chicago Tribune. A Tribune analysis of three years of data for suburban Illinois departments found that only 44 percent of those alerts from dogs led to the discovery of drugs or paraphernalia. For Hispanic drivers, the success rate was 27 percent.
Even advocates for the use of drug-sniffing dogs agree that many dog-and-officer teams are poorly trained and prone to false alerts that lead to unjustified searches. Leading a dog around a car too many times or spending too long examining a vehicle can cause a dog to give a signal for drugs where there are none, experts said.
Dog-handling officers and trainers argue the canine teams' accuracy shouldn't be measured in the number of alerts that turn up drugs.
Just doing their jobs
