I don't know legally but i am in michigan andd they will only refill at walgreens on the exact 30 day mark for me. Can you explain to the doc you will be gone and need a double script for one or else use it at a walgreens and then fill the second at a walgreens in the state your going to be in. I did that from ark to mi at walgreens. I lived in ark gave them my scripts then when i moved to mi i just filled them at walgreens here and they looked it up on the computer and filled it.