I am just wagering a guess here....
I have a feeling it would start fresh. Can you imagine the man hours it would take to input every controlled prescription into a statewide database? Man hours=tons of money. No state is going to want to spend that kind of money to pay people to go through all those records. Besides that, there are privacy issues. You can't have some clerk going through all the records like that.
I really believe it will start fresh and all records will be put in by the pharmacist who fills the scripts. Just a guess though....