Double jeopardy protection: prior conviction or acquittal bars retrial only where the same ingredients are involved. The principle of autrefois convict or double jeopardy prevents prosecution or punishment twice for the same offence; the plea of autrefois convict/acquit succeeds only if the earlier conviction or acquittal necessarily involves the same ingredients as the later charge. Statutory and procedural provisions bar multiple punishments and retrial while a conviction or acquittal stands. Administrative forfeiture or penalties imposed by non judicial authorities do not automatically amount to judicial punishment and therefore may not bar subsequent criminal prosecution.