[aaron425]

Might be some sort of liability aspect to this, where the doctor has to certify in case something goes wrong. Do nurses/PAs have to carry malpractice insurance? Not super clear on this myself.

[phren0logy]

Nurse Practitioners can be sued for malpractice, but despite practicing independently they are held to a significantly lower standard of care.

[ip26]

I think NP's do.