Who let the dogs in? Who Who Who?

The Supreme Court did, by declaring a sniff is not a search

Jacob Sullum
Police used to need probable cause to search the trunk of your car. Now all they need is a dog.

Here's how it works: An officer pulls you over because you're driving a bit too fast or a bit too slow, or because you have a broken tail light, or because you're not wearing your seat belt, or because you forgot to put your new registration sticker on your license plate. He is soon joined by another officer with a drug-sniffing dog, which "alerts" when it gets near your trunk.
Or so the officers say. You have no idea what this particular dog does when it smells contraband, and the dog isn't talking. But now the police can look in your trunk. A minor traffic stop is thus transformed into an embarrassing, invasive, intimidating, time-consuming search for illegal drugs.
The Supreme Court recently gave its approval to this sort of stop-and-switch in a case involving a man named Roy Caballes, who was pulled over on Interstate 80 by an Illinois state trooper for driving six miles an hour faster than the speed limit. Caballes happened to have 282 pounds of marijuana in his trunk, but even those of us who are not pot smugglers should worry that the Court saw nothing wrong with the circumstances that led to his arrest.