Whether Pennsylvania's Maroney standard for ineffective assistance requires a defendant to prove prejudice, and whether it is substantively the same as the federal Strickland standard.
Holding
Yes. A defendant must show both that counsel's challenged act or omission was arguably ineffective and that it likely prejudiced the defense; properly understood, Maroney and Strickland establish the same rule.
Reasoning
Strickland requires two showings: deficient performance and prejudice. Prejudice means a reasonable probability that, absent counsel's unprofessional errors, the proceeding's result would have been different. The inquiry is directed not simply to isolated attorney error, but to whether the adversarial process broke down so seriously that the result is unreliable.
Maroney likewise evaluates counsel's stewardship in light of available alternatives, presumes counsel effective, and asks whether counsel's chosen course had a reasonable basis designed to serve the client. Pennsylvania cases also repeatedly required a defendant to demonstrate how counsel's alleged ineffectiveness caused prejudice.
Pierce relied on Maroney's statement that an unreasonable strategic choice is prejudicial a fortiori, as well as Commonwealth v. Badger's warning against a harmless-error analysis. The Court acknowledged that this language could be read as treating prejudice as automatic once counsel lacked a reasonable basis.
But the Court concluded that this reading conflicted with Pennsylvania's actual and repeated application of the ineffectiveness doctrine. Pennsylvania decisions had consistently required both a showing of unreasonable or deficient performance and a showing that the deficiency prejudiced the defendant. To the extent Maroney or Badger was understood to exclude prejudice from the inquiry, the Court expressly overruled that understanding.
The Court held that Article I, Section 9 of the Pennsylvania Constitution supplies independent and adequate state-law grounds, but affords neither more nor less protection than Strickland in this context. The shared textual and policy considerations led the Court to treat Maroney and Strickland as identical rules.