From the linked article:
Proponents say the measure is necessary because Florida law gives drunken drivers an incentive to take off after a crash. If they stay at the scene, they will likely face harsher penalties for DUI.
“At the moment, they are much better off hiding until their blood alcohol level drops,” said Markus Wagner, a University of Miami law professor involved in the effort to pass the bill.
And example of an unintended consequence from the passage of another law, designed to fix a non-legal problem. In other words one's fellow citizens and elected judges weren't instituting enough 'punishment' so the law was modified to do so which is a problem of people, not necessarily the law. Such modifications lead to unintended consequences like making it better to flee the site of a crash until one's blood alcohol level is legal... I wonder what unintended consequence this new law might have?