3. Finding/removing traps pertains to relatively small
        mechanical devices such as poisoned needles, spring blades,
        and the like.
 
 
Pick Pockets Open Locks Finding and Removing Traps Setting Traps Moving Silently
Hiding in Shadows Hear Noises - Climbing Walls Back Stabbing
The Thief - Dragon magazine 1e AD&D

        Finding is accomplished by inspection, and they
        are nullified by mechanical removal or by being rendered
        harmless.

ADQ: If a thief finds a trap but fails in an
attempt to remove it, what is the result?
ADA: It is usually triggered, but this is
always at the DM's option. Many systems
may be used to determine it randomly -- a
factor of the actual "remove traps" roll, a
separate roll, a note in the trap description,
etc. Some traps would obviously be triggered
by attempts to remove them, and
such obvious details should take precedence
over random determination.
(Polyhedron #21)


 

Finding/Removing Traps is accomplished in exactly the same manner as opening locks.

Roll for each function separately (a trap must be located before removal can be attempted).
One try only per thief is allowed.
Success deactivates the trap.
 


 


DMG:

Finding And Removing Traps: Use the time requirements for opening locks. <(From 1-10 rounds, though most traps will take 1-4 rounds to find and remove.)>
Time counts for each function.
Small || large traps can be found, but not magical or magically hidden traps.
 




<
LTH (The Thief: A special look, d47, bd5)
Finding and removing traps are two
separate acts. It is best for the DM not to
go into detail on what kind of trap is
found, because that might tip off the way
to disarm the trap. Some traps can be
obviously disarmed and thus the 2ond
act (removing) does not come into play.
The DM is wise to say something like:
“You find no traps,” or “You think you
disarmed it,” as opposed to “There are
no traps,” or “You have disarmed it.”
Only if the character is absolutely sure
(100% chance) should a definite announcement be made.
A new ability in this category is given
below.
>