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1. Does the use of police dogs to detect drugs/explosives/illegals as described in this case constitute a violation of the 4th Amendment? Why or why not?
No privacy violation that I can see. One's right to privacy does not extend to that bit of atmosphere that surrounds the car. That's what the dog is sampling. To the dog, the contraband was in plain sight (sniff?) and just as apparent as a bag of marijuana sticking out of a shirt pocket. The police should not be penalized for having an effective and non-invasive tool for interdiction.
If the police compelled the driver to open the trunk to conduct a canine search you could argue cause. If the driver was detained without cause for the dog to arrive, the canine search in itself would not be a violation, but should be excluded as being predicated on a violation.
To me, this is no different than the odor of alcohol being used as cause for a breath test. Would an officer that hears a person inside the car saying "Hide the dope." have cause for a search? How would that be fundamentally different?
[Edit]Here is the narrative from
Illinois v. Caballes taken off the US DOJ site:
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1. On November 12, 1998, at approximately 5 p.m., Illinois State Trooper Daniel Gillette stopped respondent on Interstate Route 80 in La Salle County, Illinois, for driving 71 miles per hour in a 65 mile per hour zone. Gillette radioed the police dispatcher to say that he was making the stop and to ask for a check on respondent's license plates. Hearing the radio transmission, a second trooper, Craig Graham, departed for the scene with his drug-detection dog. Pet. App. 1a, 12a.
Once Gillette pulled over respondent's vehicle, he informed respondent that he had been speeding and asked to see his driver's license, vehicle registration, and proof of insurance. Respondent complied. Gillette noticed an atlas on the front seat, an open ashtray, the smell of air freshener, and a pair of suits hanging in the back without any other luggage. Gillette told respondent to reposition his vehicle out of traffic on the shoulder of the road and then to come back to the police car. After both vehicles were moved away from traffic, respondent entered the patrol car and was told by Gillette that he would be receiving a warning ticket. Gillette then radioed the police dispatcher to check on the validity of respondent's driver's license and to check for outstanding warrants. Pet. App. 2a, 12a.
While waiting to hear back from the dispatcher, Gillette asked respondent about his destination and what Gillette had observed was respondent's "dressed up" attire. Respondent replied that he was moving from Las Vegas to Chicago, and that he was dressed up because he was a salesman, although currently unemployed. Respondent was nervous and continued to be nervous even after being told that he would be issued only a warning, which Gillette found unusual. Pet. App. 2a, 12a-13a.
At 5:09:58, the dispatcher advised Gillette that respondent had surrendered a valid Illinois driver's license to Nevada and, at 5:11:58, the dispatcher confirmed the validity of respondent's Nevada driver's license. Gillette immediately requested respondent's criminal history from the dispatcher. Gillette next requested respondent's permission to search his vehicle, but respondent refused. Gillette asked whether respondent had ever been arrested, and respondent said that he had not. At 5:12:42, the dispatcher advised Gillette that respondent had two prior arrests for marijuana distribution. Gillette began to write the warning ticket. While writing the ticket, Gillette was interrupted by another officer calling him on the radio about an unrelated matter. Pet. App. 2a, 13a, 17a n.1.
Also during the time Gillette was writing the ticket, Trooper Graham arrived and started walking his dog around respondent's vehicle. At approximately 5:13, while Gillette was still writing the ticket, Graham informed Gillette that the dog alerted at respondent's trunk. Gillette then searched the trunk and found marijuana. At 5:15, Gillette changed the activity code for the stop to a narcotics investigation. Respondent was arrested and taken to the police station.