There is lots of ways depends on a document but usually stamp, or paper its on.
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One way to spot a fake Christian Audigier is to look at the graphics. If the graphics are blocky or thick, it is a fake.
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Forgery!!
You can spot if a tech deck is fake when it does not have the grip tape, and if there are pictures on both sides of your tech deck.
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There is no way a visitor can spot fake security cameras without taking the camera apart. There is no clear way of seeing that a camera might be fake when looking at it.
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Forgery
The notary is not certifying the document, only the signature. He has to check the signer's identification and watch him sign the document.