In these situations, "the efficiency of a warrant requirement would be minimal."

The administration has offered no evidence that existing warrant requirements are too restrictive.

The concept is similar to the "plain view" exception to the warrant requirement, under which the police may seize objects they can see.

So it falls under the warrant requirement for searches.

The various warrant requirements have been incorporated against the states.

There is an exception to the warrant requirement for emergency calls for service.

Courts have developed a number of exceptions to the warrant requirement:

There are also "exigent circumstances" exceptions to the warrant requirement.

Plain view is an exception to the warrant requirement of the 4th Amendment.

Only in this unique instance could the warrant requirement be waived.