Under the Fourth Amendment, general requirements state that searches and seizures must be based on probable cause and be conducted with a warrant, unless certain exceptions apply.
Among the given options, the situation that is "allowed" depends on specific exceptions to the warrant requirement.
Using evidence obtained from a warrantless search when a person boarded an airplane can be permissible, as individuals boarding an aircraft are subject to certain safety and security checks which are considered a special circumstance that allows for warrantless searches.
The other options involve searches of a person's home or car that typically require a warrant or probable cause, and thus are more likely to be viewed as violations of the Fourth Amendment unless valid exceptions are demonstrated.
So the answer is: • using evidence obtained from a warrantless search when a person boarded an airplane.