No — since no harm occurred, no violation exists.

Yes. In states where PDMP checking is mandated, failure to check constitutes a regulatory violation regardless of whether harm resulted. The PMHNP should check the PDMP retroactively, document the oversight, and implement systems to prevent recurrence.

No — PDMP checking is recommended but not legally required in any state.

A violation occurred only if the patient was already receiving controlled substances from another provider.