How Can You Understand An FBI ID Is Real.Anyone Can Make A Copy Of It At Least?
You cannot, as you cannot with any form of ID. There is no such thing as unfakeable ID, though some may cost more than others to fake. But if someone shows you fake ID claiming to be FBI (or any other police organisation) they have committed a serious criminal offence by that act alone. The ID should have some form of traceback so that you can call the originating organisation and ask about it. So anybody faking it is immediately putting themselves at risk by that act alone, before they go any further. So all you can do is hope that this acts (as it generally seems to have done) as a sufficient deterrent that it is very rare for people to try it on.