The Eberron CS (3.5) says that you can enchant a warforged as a suit of armor. Would he then detect as magic?
I had this come up in a past session:
I had a trap which was triggered by detect magic inside a room's entrance, with a magical artifact inside. (it was meant to act as an alarm system.) The players all stripped off their magic gear to get inside, except the warforged, who decided to stay put.
Was there anything he could've done to bypass the detect? They're low-level (4th/5th) so not really throwing around a lot of power or versatility.