Its easy to forget, sometimes, that Kabuto styles himself a doctor. Not many who have seen him in the labs would dispute that claim...but then again, few have seen the labs and lived to tell the tale. But Kabuto does deserve the title, if neither from the degree hanging on his wall nor his activities in the labs, then from this 'side job'.
(
Its four o'clock in the morning. What else would a doctor be doing? )