Final answer:
The requirement that a prescription must be on a 2-line prescription blank in Washington state is False. Prescriptions must contain specific information and security features, but not necessarily be on a 2-line blank.
Step-by-step explanation:
The statement that a prescription written by a WA prescriber is not valid unless it is written on a 2-line prescription blank is False. Regulations can vary, but in Washington state, there is no specific requirement that prescriptions must be on a 2-line blank. Instead, there are detailed rules about what information must be included on a prescription, such as the patient's name, the date, the drug name and dosage, the prescriber's instructions, and the prescriber's signature. Prescriptions may need to have specific security features to prevent fraud, but a '2-line prescription blank' is not a universally mandated requirement.