4th Amendment; 14th Amendment, Due Process Clause
1957, Cleveland, Mapp sees Police Officers in her house with a search warrant. The address on the warrant is wrong. Police officers ignore her and continue ransacking her house and finds 2 books, a book on sex and a sketchbook of nude figures. They arrest her for possession of obscene materials.
She was tried and committed for 7 years in prison. Bailed out.
Lawyer took the case to the Supreme Court in 1960.
"Exclusionary rule" applies to citizens in state courts, ALL have 4th Amendment Rights (evidence cannot be introduced into trial if it was not constitutionally obtained)
Further developed "incorporation"