Mapp started out in state court with her case. She then brought it to the Supreme Court and lost her final case. (Writ of Certiorari)
After Mapp's case the judges had a Conference. This is where they came to the conclusion that she's guilty.
"In Mapp v. Ohio (1961), for example, the American Civil Liberties Union filed an Amicus Brief that argued for the exclusion from a criminal trial of evidence seized without a search warrant."
Oral Arguments for the case were given by A.L. Kearns and Bernard A. Berkman.