Commonwealth Pennsylvania v. John Melilli

Presented for consideration as the main issue in this appeal is whether our jurisprudence encompasses a good faith exception to the requirement of probable cause to support an application for the installation of pen registers. Because we hold that no such exception exists as yet in this Commonwealth, as based on these facts, we reverse the Superior Court and reinstate the decision of the suppression court disallowing all of the telephone evidence. We also determine as part of this analysis that the installation of pen registers must be supported by probable cause.