Reveal what happened and why you’re suspicious. The police will probably have a copyright detection pen which they can use to mark the bill. In case the mark turns dim, it’s probable that the bill is fake. Some trade dollar fakes have an used rim- they struck the coin 'disc' https://danteqxjdf.frewwebs.com/35258859/a-secret-weapon-for-where-can-i-copyright-dollar-bills