Question

How is stop and frisk unconstitutional

Answer 1

Look at your search and seizure part of the constitution.

Answer 2

"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."

Foruth amendment.

Answer 3

You need probable cause to search someone....you can not just search a person because you think they look shady.