New Adderall road block just dropped

Half the pharmacies in town are refusing to dispense my sister's lisdexamfetamine prescription because she doesn't have an existing "maintenance prescription" with that pharmacy.

They (presumably) don't want any patients who receive only a controlled substance from them for fear of the DEA accusing them of being a pill mill.

What if someone doesn't have any other prescriptions? Or they do but their regular pharmacy is out of stock? Every year it's some new bullshit.