Answer:
4th Amendment.
Step-by-step explanation:
The 4th Amendment states;
"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 the Oath of affirmation and particularly describing the place to be searched and the persons things to be seized."
(The police shouldn't just be searching you out of no where, they need permission from the person they are searching, or an actual permit from their superiors)