Whether Sibron's completed sentence made his appeal moot.
Holding
No. Sibron retained a sufficient personal stake in overturning his conviction despite having served his sentence.
Reasoning
A criminal appeal does not become moot merely because the defendant has been released. Sibron could not realistically obtain review before his short sentence expired: New York denied him bail pending appeal, and ordinary appellate delays prevented earlier review despite his diligent efforts. The Court refused to allow the State effectively to insulate short-sentence convictions from constitutional review.
Sibron also faced possible collateral legal consequences from the conviction. Under New York law, the conviction could affect future criminal proceedings, including impeachment of his character and sentencing. The Court held that a criminal case is moot only when there is no possibility of collateral legal consequences, a showing New York could not make here.