Most of the traps in Durlag's are over 50% if I remember right. The way disarm traps works is the trap difficulty is subtracted from your ability, a percentile roll is made and must be lower than your score. For example: a trap has a 50% disarm, your disarm is 70%, you have a 20% chance to disarm this trap (random number generator comes up 20 or less). Potions of perception give you an extra 20%.
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