Where is the switch allowed to be placed in the bathroom?

In North America the switch can be placed either inside the room or outside the room. When it is inside the room it is placed on the opening side of the door so that when you enter the room, the switch can be flipped on. When the switch is located on the outside of the room a convenient placement is close to the door opening so that when you open the door the switch can be turned on in one continuous motion.