Problem
A police officer who works near a local airport observes a car speeding on the road leading into the airport. He stops the car and approaches the vehicle, where he sees a man alone in the driver's seat and his suitcase in the back seat. The travel or is sweating profusely, and keeps telling the officer he is in a hurry to catch a flight. The officer asks the traveler if he can search his luggage, and the man says yes. When the officer unzips the bag and starts the search, the man changes his mind and says no. At that point, the officer leaves the bag unzipped but still laying on the back seat where the contents are not visible. He calls for another officer to bring a drug detection dog to the site. The other officer and the dog get called to a more urgent search and don't appear. The traveler asks to leave, which the officer says is ok, but he won't let him take his bag. The traveler refuses to catch his plane, and asks for an attorney.
Analyze this case from both the traveler's and the police officer's perspective. What constitutional rights are at issue? Have any of them been violated?