Final answer:
The requirement to mark a hard-copy controlled substance prescription with a red "C" might be waived when electronic tracking systems are used or if state regulations permit it, with the goal of enhancing prescription monitoring and preventing abuse.
Step-by-step explanation:
The requirement to mark a hard-copy controlled substance prescription with a red "C" may be waived under circumstances such as changes in regulations or pharmacists using an electronic system that tracks prescriptions, negating the need for a physical mark. In some instances, if permissible by state law or regulation, the marking requirement could be superseded. The process for handling controlled substances is highly regulated, and any changes to procedures like the red "C" requirement would be due to updates in legal or administrative protocols aimed at improving prescription tracking and preventing misuse.