When I write that something is a best practice, that means that I believe it is something you should do. It does not mean you must do it, as there is no way I could know all the requirements and rules under which you may be operating.
Please learn the difference between “should” and “must” before you say anyone’s statements or advice are incorrect or wrong.
“Should” means do this good thing for positive benefits or to avoid negative results. “Must” means you’re required by law or otherwise.
Most things you should do are not required by statutory law.
The things you should do may be covered by case law or common law, which are vast and deep and filled with much details upon which the statutory law rests.
One of several reasons that only lawyers are allowed to give legal advice is that only lawyers are required to keep up with the law in all its many aspects or to have sufficient access to the resources necessary to determine what it may be in a given jurisdiction at a given time. As most law is actually case law which is determined by judges, not statutory law which is made in bills passed by legislatures and signed by executives (mayors or governors or the President), it is a very good idea to be careful what you say about “the law” unless you are an attorney or a judge. A way that I have found to be careful is to use words such as “should” or “some.”
Or, the things you should do may be a matter of common sense or logic. For instance, the very reasonable statement that you should verify that someone who claims to be representing another person actually is doing so before you notarize a document for them (either by having them swear an oath under penalty of perjury to that effect or by having them show you the original, notarized power of attorney document).
Why would you take their word for it with no proof whatsoever? Even if your state’s statutory law does not require you to certify the capacity under which they are signing, that still leaves the matters of common sense and logic. Have you never heard that part of the function of the notary is to cut down on fraud? You help with this worthy goal by never letting someone sign a document to be notarized without verifying their identity. Logically, part of that would include verifying their claim that they represent someone else (either through a power of attorney or as a corporate officer). As a sworn statement is considered legal evidence, that would be one way to verify it. You may not have to certify that you verified it — but not verifying it would mean you failed to fully identify who is signing the document. This is just common sense AND logic.
Or, those things you should do may be included in professional ethics or just plain human decency, both areas that seem to be very misunderstood by many people and which will require some further thought before I can comment properly upon them.
Now, if you know for a fact that your state prohibits the action or practice I have recommended, please feel free to let me know.
Otherwise, if I write that someone “should” do something, please consider what the likely outcomes will be for you and the public if you do what I recommend. If those outcomes seem to you to be positive, then it makes sense to follow my advice.