In addition to the federal requirements, Montana state law requires that if a prescription is written, it must be tamper-resistant and contain all of the following characteristics:
- one or more industry-recognized features designed to prevent unauthorized copying of a completed or blank prescription form;
- one or more industry-recognized features designed to prevent the erasure or modification of information written on the prescription pad by the prescriber; and
- one or more industry-recognized features designed to prevent the use of counterfeit prescription forms.
Read documentation here.
For the federal requirements, you can refer to the official documentation here and here.