Can only but agree....
As an advocate of minimum paper work. Down this way we might handle it like this-:
Most Airports these days workers have Approvals or ID and taxis require it to pickup at Airports.
The ADM might as an authorised person watch out for said taxi driver, when sighted, secure his ID to identify him.
With ID in hand return to his office place it in his top draw with the intent to forward it to the appropriate authority with a letter of explanation (in due course).
If the taxi driver complains that he can not work without the forced ID/approval suggest he take it up with the Police or appropriate authority?
"In Aviation Safety, compliance is not optional".