Oh, please. With three states affected and 400 feds on the ground, you expect me to believe that a local cop is in charge of anything other than standing in front of microphones? Local PDs are used to assigning three detectives to a homicide case. This one reportedly has 1500 people involved. The FBI lab is handling the bullet fragments, and I'm sure the feds are calling the shots on methods of evidence gathering.
Also, the Virginia top cop said on TV that the FBI was in charge of investigating the terrorism angle. Now what could that involve? It is obviously terrorism, even if it turns out to be an AWM or generic fruitcake.
I thought it was the "F-Troop" lab. It is their rice bowl after all.