• to account for sg, to bear record to sg, to bear testimony to sg
• establish an alibi, to establish an alibi, to prove an alibi
• admitted, authenticated, certified, justified
• corroborative, corroboratory, justificatory, vindicative
• acknowledgement, authentication, certificate, certification, confirmation, corroboration, demonstration, excuse, justification, legitimation, making of an excuse, offering of an excuse, proving, substantiation, verification, voucher, warrant
• capable of proof, defensible, explainable, justifiable, supportable, verifiable
• clearance, pass, ticket, warrant
• to give a good account of oneself, to prove one's identity
• to require documentation, to require identification