One of my players (elven fighter) read this: in the AD&D 2e PHB and decided to search every room at least 10 times:
Secret doors (those constructed so as to be hard to notice) and concealed doors (those hidden from sight by screens, curtains, or the like) are difficult to hide from elves. Merely passing within 10 feet of a concealed door gives an elven character a one-in-six chance (roll a 1 on 1d6) to notice it. If actively searching for such doors, elven characters have a one-in-three chance (roll a 1 or 2 on 1d6) to find a secret door and a one-in-two chance (roll a 1, 2, or 3 on 1d6) to discover a concealed portal.
Can you do this in AD&D or is this search a one-time opportunity for each room/hallway?
To avoid confusion, I really am asking about the searching, not elves' special “walk-by” ability to notice concealed doors. I'm also aware that finding is only the beginning and doesn't necessarily reveal how to open what the PC finds.