WASHINGTON -- Driving 6 miles per hour over the speed limit got Roy Caballes pulled over. But what happened next landed him at the Supreme Court, which considered yesterday the issue of when police can use drug-sniffing dogs.
Caballes was wearing a suit and driving a new Mercury when he was stopped on an Illinois freeway in November 1998. It looked like he would get off with a warning until a drug dog named Krott showed up and sniffed out $250,000 worth of marijuana in Caballes's trunk.
Caballes's conviction eventually was overturned on the grounds that police had no reason to search his car.
Dogs trained to find drugs and bombs are becoming more common in airports and elsewhere -- even the Supreme Court -- because of terrorism concerns. Police also often use them for routine traffic stops.
Justices will decide whether people who have given police no reason to suspect illegal activity have a constitutional protection against dog searches.
The Supreme Court has tried in recent years to better define someone's right to be left alone in their homes and vehicles. In this case, the court must clarify earlier opinions that found that use of drug-sniffing dogs is not necessarily a search that falls under the Fourth Amendment ban on unreasonable searches or seizures.
''A sniff is not a search," justices were told by Attorney General Lisa Madigan of Illinois.
Chicago attorney Ralph Meczyk, representing Caballes, countered, ''It is accusatory. It is profoundly embarrassing."
Justice David Souter appeared troubled by the prospect of more use of dogs.
''We're opening a large vista for dog intrusion," said Souter, adding that he was worried about officers canvassing garages and neighborhoods with animals. Police ''can take a dog to a front door and ring the bell and see what happens."
Justice Ruth Bader Ginsburg, a petite 71-year-old, said ''dogs can be frightening, humiliating."
Madigan responded that millions of people have dogs as pets.
Several justices, including key swing voters on civil liberties cases, seemed reluctant to restrain police.
Justice Antonin Scalia said drug dogs have been around a long time and ''the Republic seems to have survived." And Justice Sandra Day O'Connor said that canines just sniff around cars, not inside them.
However, Justice John Paul Stevens said an opening for run-of-the-mill dog searches would also allow the use of mechanical devices to search people.
Caballles's conviction for drug trafficking was thrown out by the Illinois Supreme Court. Illinois was supported by 28 states and several law enforcement groups in its appeal to the high court.
The argument inspired many canine jokes. Caballes's lawyer at one point asked if he was an underdog in the case.
The case is Illinois v. Caballes, 03-923.