Dogs lie too.

The addendum to House's "Everybody lies."

Hit & Run > The Drug Warrior's Best Friend - Reason Magazine:

"...Justice David Souter, noted, "the infallible dog...is a creature of legal fiction." Souter cited examples from court cases of dogs with error rates of up to 38 percent. A recent report in The Tampa Tribune suggests he was being generous:

Talon, who worked for the Palmetto Police Department, smelled drugs on every single vehicle during a four-month period and drugs were found less than half the time.

Circuit Judge Debra Johnes Riva said in a ruling that she had no choice but to throw out evidence in a drug case because of that track record.

...the way they've been doing business is to search pretty much any vehicle they please, using the dogs' reactions as a cover for their hunches. Given the animals' accuracy, police might as well replace them with coins or magic eight balls. At least they'd save taxpayers some money."