Reasonable Expectation of Privacy
First, you must have standing to challenge the search and seizure
For instance, the passenger in a car does not have standing to challenge a search and seizure of the truni because he has no reasonable expectation of privacy
The highest expectation of privacy is at your home. This extends to the curtilage.
No privacy interest in the smell of one's luggage.
Officer at a routine traffic stop has the right to order the driver and passengers to get out of the car.