Related Clues:

• They're checked at LAX
• Barkeeps' requests
• Bouncers request them
• Nicknames
• Bouncer's requests, for short
• Subconsciouses
• Psyche divisions
• Proofs of age
• Some kids get fake ones
• Bar requests
• Recognizes in a lineup
• Fingers, in a sense
• Some tags
• Wallet cards
• Picture cards?