Final answer:
A pharmacist cannot prescribe a Schedule I drug as these drugs are not approved for medical use and cannot be prescribed or dispensed legally.
Step-by-step explanation:
The statement that a pharmacist may prescribe a Schedule I drug by adapting a prescription from another prescriber is false. Schedule I drugs are classified as substances that have a high potential for abuse, have no currently accepted medical use in treatment in the United States, and lack accepted safety for use under medical supervision. Therefore, they cannot be prescribed by a pharmacist or any medical professional. Prescriptions can only be adapted or modified for drugs that are legal to dispense and that fall under schedules that allow for such changes, and Schedule I drugs do not meet these criteria.