Having worked as a paralegal in law offices, I would guess the job you were called to do may be just the administering the oath as you originally thought. Usually for a deposition, there's a court reporter making a record of the conversation. Oftentimes the court reporter is also a Notary and can administer the oath, but sometimes they aren't, thus the need for an outside Notary.
If it were me, I'd ask what the client wants the Notary to do--just the oath or stay the day. |