Kinda a funny distinction given the actual wording of the 4th:
Amendment IV
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
It’s a distinction based on pragmatism more than anything else. If you’re arresting someone and taking him to jail, you’re going to make him empty his pockets and turn over the contents regardless.