"'Useful' sounds wrong but we found more." Conan nods towards the thing in front of him. "This was a leg. There's a forearm too. Definitely foul play. Rate of decomposition indicates death occurred between a week to two weeks ago -- the recent hot weather, moist conditions of the sewer and severing of the limbs would all speed up the process. Rate of decomposition and size of what we've found all seem to indicate a single victim, but we'll have to rely on the DNA analysis done in the lab to know for sure."