How can I find out if a person is truly an RN (registered nurse).?

An elderly friend of mine has hired a lady from an ad in the newspaper to come into her home to help her with chores and errands. The lady claims she is or used to be (whatever that means) an RN. There have been some occurances that have me a little concerned. I can't really blame them on this person, but I want to know if there is a simple way to see if this person is trained the way she claims.

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