Unless DEA hasn't bothered to update their website, they still require prescriptions for scheduled drugs to be on paper or via fax. If they actually cared about

Unless DEA hasn't bothered to update their website, they still require prescriptions for scheduled drugs to be on paper or via fax. If they actually cared about security (which they don't; nobody in the US government does with the possible exception of the NRC) they'd only allow electronic prescriptions signed by an accredited CA.