In criminal cases alleging the use of force a defendant may seek immunity from prosecution. Today, this is called Stand Your Ground, but it has always been true that self-defense is a viable defense to any use of force case. A person seeking immunity has the burden to put forth evidence that the use of force alleged was reasonable against another's imminent use of unlawful force.
Carrying a concealed firearm is a felony criminal offense in Florida with several exceptions that almost eat the rule. All of the exceptions of course require that you are not otherwise prohibited from carrying a firearm concealed or otherwise. For example the exceptions do not apply to people who have an active domestic violence injunction, are on probation, or are a convicted felon.
In criminal cases, searches resulting from vehicle stops have been hotly litigated since the automobile became available to the public in mass. Since cars are mobile and not as private as your home, the Supreme Court has interpreted the constitution to afford vehicle searches and seizures less protection.