It depends on whether the ticket is considered a criminal or civil matter in the US.

For a criminal case, yes, they need to prove "beyond a reasonable doubt" - which would require that you are positively identified as the driver.

For a civil case, they only need to prove by a "preponderance of the evidence" - which is a much lower standard.

This is why tickets from red-light cameras in many states are zero-point citations. You're still charged a fine, but there's no finding of guilt attached to the offense, which keeps it away from being considered a criminal matter. (This is the same way parking tickets work.)

What does "North America" have to do with Florida?

I'm in Canada and they issue you a fine without any ID. It goes straight to the registered car owner. Simple as.

The issue is that currently in FL there are points / demerits issued for violations, and these can cause the loss of a license, increases to insurance, etc. This is not a problem if an officer can ID you directly.

In Brazil, you can identify who was driving the car and they will get charged with the fine and get the points on their licence. You can do it all using an app on your phone. It's really simple.

I don't know what happens if the other person denies it though.

Many US states have switched to that approach. The ticket goes to the registered owner of the vehicle and no penalty points are attached. It's treated more like a parking citation than a traditional moving violation.