"The grave." Dramatic, a little spooky. Flippant. "I've arranged to have another of the bodies exhumed - you're going to see if you can find anything the medical examiner couldn't. Similar tissue samples, ideally."

Which should be fine, since she's a medical doctor in the FBI. This is the kind of assignment she ought to expect. All the same, he can't help but ask: "You're not squeamish about that kind of thing, are you?"