"And there was no one else that knew you were guarding the reservoir? What about the guards themselves? Surely you used more than one-labor laws and what not." Because if no one else knew than by process of elimination things didn't look good for that head detective. Sherlock was definitely going to need to question him.

"I need files on everyone working for the KPD as well as any paperwork from the time you made the discovery." He decides very suddenly. "Somewhere in your department you may have a rat."