Driving without a valid driver license violates Florida Statute § 322.03. A first offense is a second-degree misdemeanor, punishable by up to 60 days in jail and a $500 fine, but repeat offenses escalate quickly: a second conviction is a first-degree misdemeanor, and driving after a third license cancellation or revocation can be charged as a third-degree felony. Common defenses include proving a valid license existed at the time of the stop, challenging the traffic stop itself, or negotiating a dismissal after the license is obtained.