Can a confession alone sustain a criminal conviction?

Yes, a confession can sustain a criminal conviction, but it typically must be corroborated by additional evidence to ensure its reliability and the absence of coercion. Courts often require that confessions be voluntarily given and not obtained through duress or improper interrogation techniques. In some cases, particularly if the confession is detailed and specific, it may be sufficient on its own. However, the legal standards can vary by jurisdiction.