If you get stopped with a tag on your car that is from a different vehicle you can get charged by way of arrest of notice to appear for attaching tag not assigned.
This is a criminal charge that can land you in jail and put a permanent mark on your record. It is normally easy to beat because the actual charge is attaching the tag to the other vehicle not simply having the wrong tag on your car yet cops will arrest people even without the admission that they are the ones who attached the tag or had knowledge that someone else attached the wrong tag to their car.
If you are stopped by a cop for this under no circumstances should you say anything or admit that you know it is the wrong tag on your car. The State cannot prove this charge simply because you have the wrong tag on your car. They need to prove knowledge by you in order to prove this beyond a reasonable doubt.
The charge of attaching a tag not assigned is a second degree misdemeanor which means you can be up to 60 days in jail, up to 6 months supervised probation and up to a fine of $500.00. It also could mean having an arrest and criminal conviction on your record. This is why it is very important to hire as experienced criminal defense attorney anytime you are being charged with a criminal offense in the State of Florida.
I have seen many times where the dealer will put the wrong tag on a car they sell and the person who just bought the car gets arrested. It is unfortunate but remember to remain silent so that we can win this case in court for you.