From the very beginning, every time a detective introduces themselves they state they're from the "Leesburg sheriff's office" despite an early depiction of the actual agency's badge on the wall of (staged) room 3013 - & the real shoulder patch on uniforms. Leesburg is just a small Virginia town far north of Washington & the seat of Loudoun County, though it does have its own correspondingly small police force which evidently was not the lead agency, if participant at all, investigating this horrific crime.