Whether due process requires hearings before a State may revoke probation after sentence has already been imposed.
Holding
Yes. A probationer is entitled to the same preliminary and final revocation hearings required for parolees in Morrissey v. Brewer.
Reasoning
The Court treated probation revocation as constitutionally indistinguishable from parole revocation for this purpose. Neither proceeding is part of the original criminal prosecution, but each can deprive a person of conditional liberty and return that person to prison. That serious loss of liberty triggers the protections of due process.
Morrissey required two stages of process for parole revocation, and those requirements apply equally to probation. The preliminary hearing determines whether probable cause exists to believe a violation occurred; the final hearing determines whether a violation occurred and whether revocation is the appropriate response.
At the final hearing, due process includes written notice of the alleged violations, disclosure of adverse evidence, an opportunity to appear and present evidence, conditional confrontation and cross-examination of adverse witnesses, a neutral and detached decisionmaker, and a written statement of the evidence relied on and reasons for revocation. Scarpelli received no hearing at all, so his revocation was constitutionally deficient.