Final answer:
The sale of CFC and HCFC refrigerants is restricted to technicians who are EPA certified in refrigerant recovery.
Step-by-step explanation:
The sale of CFC and HCFC refrigerants is restricted to technicians who are EPA certified in refrigerant recovery. This means that only technicians who have received certification from the Environmental Protection Agency (EPA) can legally sell these refrigerants. This restriction is in place to ensure that the refrigerants are handled properly and to prevent their misuse or incorrect disposal, which can lead to environmental harm.