Final answer:
Physician Assistants may prescribe a Schedule IV benzodiazepine up to a 30-day supply according to many state laws, with variations depending on specific state regulations and institutional policies.
Step-by-step explanation:
The question pertains to the prescriptive authority of a Physician Assistant (PA) when it comes to controlled substances, specifically Schedule IV (CIV) benzodiazepines. The supply that a PA may prescribe can vary by state law and institutional policies. However, many states and regulations may limit the initial prescription of CIV benzodiazepines to a 30-day supply unless there is a specific indication to prescribe a different quantity. It's important for practitioners to be aware of and comply with both federal and state regulations when prescribing medications. Always consult with the latest guidelines or the pharmacy board of the respective state for the most accurate and updated information.