Also the fact that Lestrade basically arrested Sherlock with no evidence whatsoever other than that Sherlock was faster with the labwork.

And the child's scream (if she was hysterical enough and they hadn't been able to get anything else out of her that day, especially). I also got the impression it was part of there being a general inquiry on why he'd been let in on so many cases and whether his involvement tainted them, but. Still.

(Argharghargh. >.< I've taken only a few forensics classes, and that was a while ago, but ARGH.)