Virginia has a slow down/move over law. In section 46.2-921.1 of the Code of Virginia it states that drivers must yield the right of way or reduce speed when approaching stationary emergency vehicles on the highway.
The driver of any motor vehicle, upon approaching a stationary emergency vehicle that is displaying a flashing, blinking, or alternating emergency light or lights (i) on a highway having at least four lanes, at least two of which are intended for traffic proceeding as the approaching vehicle, proceed with caution and, if reasonable, with due regard for safety and traffic conditions, yield the right-of-way by making a lane change into a lane not adjacent to that occupied by the stationary emergency vehicle or (ii) if changing lanes would be unreasonable or unsafe, proceed with due caution and maintain a safe speed for highway conditions.
Violation of any provision of this VA law constitutes a Class 1 misdemeanor. If the violation resulted in damage to property of another person, the court may, in addition, order the suspension of the driver's privilege to operate a motor vehicle for not more than one year. If the violation resulted in injury to another person, the court may, in addition to any other penalty imposed, order the suspension of the driver's privilege to operate a motor vehicle for not more than two years. If the violation resulted in the death of another person, the court may, in addition to any other penalty imposed, order the suspension of the driver's privilege to operate a motor vehicle for two years
In VA a Class 1 misdemeanor can come with penalties of confinement in jail for up to twelve months and a fine of up to $2,500, either or both.
This "move over" law has been in effect for 6 years in Virginia (since 2002) and at least 40 states other states require drivers approaching a police vehicle with flashing lights activated either to make an immediate lane change or to slow down at least 20 MPH under the posted speed limit.
From our research it appears there are currently 10 states that lack any form of a move over law. These states are California, Connecticut, Delaware, Hawaii, Louisiana, Maryland, Mississippi, Nebraska, New Jersey and Rhode Island. So while your home state does not have the move over law, most all other states do.
As for the move over law, it was likely publicized when it first came out but with most all states now having such a law the state of VA thinks that drivers should now know to move over or slow down automatically when they see emergency vehicles in the roadway or on the side of the road.
If you've been cited for this infraction, find out how much his ticket will cost by contacting the Virginia court listed on his ticket. The clerk of the court should be able to give you the range that a first ticket for this offense usually runs in the county you was cited in.