It was not until the 1960's when the Supreme Court shifted from the conventional approach to the reasonableness Fourth Amendment approach. It states that the 2 clauses are separate, and address separate problems. The warrant clause tells us what the Fourth Amendment requires only when law enforcement officers want to obtain warrants. Since a small percentage of searches and seizures are made with warrants and many searches and seizures don't require probable cause either, the warrant clause isn't very important (Davies, 1999).
Discussion
Today's stop and frisk law grow out of the practical problems police officers face ...