You can harmlessly absorb a weapon you are touching (even a poisoned one) into your arm, as long as it's not in another creature's possession. The weapon must be a light weapon for you at the time the spell is cast. The absorbed weapon cannot be felt under the skin and doesn't restrict your range of motion in any way. An absorbed weapon cannot be detected with even a careful search, although detect magic reveals the presence of a magical aura. The only evidence of its presence is a faint blotch on your skin shaped vaguely like the weapon. When you touch the spot (an action equivalent to drawing a weapon), or when the spell duration ends, the weapon appears in your hand and the spell ends.