Final answer:
A doctor is generally required to provide a handwritten or electronic signature for controlled substance prescriptions, with stamped signatures usually not being acceptable due to regulatory requirements.
Step-by-step explanation:
The question of whether a doctor can stamp their signature on a controlled substance (CS) prescription is dependent on regulations that govern prescribing practices. As per the Drug Enforcement Administration (DEA) and various state laws, a written prescription for a controlled substance must be signed by a practitioner. While there may be some variance depending on location, generally, the signature must be handwritten or electronic; stamped signatures are usually not acceptable for controlled substance prescriptions. This ensures that the prescription is indeed authorized by the practitioner and reduces the risk of fraud.
Answer: c) Not applicable