John's Law of 2003

John's Law of 2003 - Directs the Secretary of Transportation to withhold specified Federal highway funds from a State that fails to enact and enforce a law that requires: (1) an agency to provide an individual summoned to transport or accompany a person who has been arrested for public intoxication with a written statement advising that individual of his or her potential criminal and civil liability for permitting or facilitating the arrestee's operation of a motor vehicle while the arrestee remains intoxicated; and (2) a law enforcement agency to impound the vehicle of a person arrested for public intoxication for a period of 12 hours or until such later time as the person is able to operate the vehicle in a safe manner and not in violation of driving while intoxicated laws.

Allows withheld funds to: (1) remain available for apportionment to the State (once it meets Act requirements) for four years; (2) remain available for expenditure for three fiscal years after apportionment; and (3) be redistributed to other States if the originally targeted State is not in compliance, or the funds are not obligated for expenditure, within such periods.