@duggage It seems Investigation can be used instead of Perception for detecting secret doors(ex Dungeon Delver). Yes? Traps? Typo? Yes, it can be. Depends on situation – perception can find physical signs, investigation allows deduction

— Mike Mearls (@mikemearls) September 19, 2014

@duggage Examples – Investigation might reveal trap door hidden beneath a rug by deducing its presence a la Sherlock Holmes

— Mike Mearls (@mikemearls) September 19, 2014

@duggage Perception might find a hidden door because of its outline in the pattern of bricks of a wall

— Mike Mearls (@mikemearls) September 19, 2014

@duggage DM call, or specified in the adventure. DC might differ, too.

— Mike Mearls (@mikemearls) September 19, 2014