The Blue Rose Task Force?
Nobody thought to even wonder why the FBI was involved in a simple murder case from the get go. Further down the line they introduce Lil to provide coded information about the case. My guess is Lil or Gordon (or both) are receivers of paranormal turbulence and know instantly whether a case is Blue Rose or standard. It's what I've suspected ever since FWWM, but this episode finally confirms that they work these paranormal cases specifically.