What defines the unlawful use of a license or ID?

The unlawful use of a license or ID is defined as using someone else's ID. This act involves misrepresentation and can have serious legal consequences. When an individual uses another person's identification, they are committing identity theft or fraud, which is a criminal offense. Such actions undermine the integrity of identification systems and can lead to severe penalties both criminally and civilly.

The other options relate to situations but do not specifically capture the essence of unlawful use. For instance, using an ID solely for boarding flights does not necessarily constitute unlawful use if it's your own ID and is valid. Not carrying an ID while driving pertains to legal requirements for operating a vehicle but isn't classified as unlawful use if one owns their own ID and is simply not in possession of it. Similarly, having an expired ID is an issue of validity rather than unlawful use; it suggests a failure to keep one's identification current but does not involve the use of someone else's ID or misleading others.