When you use the term drop ship, that means the car will ship from the factory directly to you, which will never happen. It must go to a Chevy dealer for the PDI before you can pick it up. It's GM's policy. No way around it. If you mean to say that you are purchasing a Volt from a dealer's inventory, then yes, they can ship the car directly to your door as it has already been prepped and checked from the factory. I have done it both ways.
If you order a car from an out of state dealer or a dealer not in your local area and they put your order in with the factory, they can opt to have the vehicle drop shipped to a dealer in your area and you can then have a courtesy delivery done by the dealer in your area. I am thinking you meant to say that you are going to purchase a vehicle from the dealer's inventory and they are going to ship it directly to you.