This just came up in our game and need to know what is correct ruling. I tried to detect the presence of magic in an area and failed, and there was a magic set of armor. We took the armor not knowing it was magical and we moved to another room and i detected again (the room was more than far enough away from the last room). This time i made my role and we had not rested. The question is can i detect the magic on the armor in this room even though it was in an area i already checked?