term:

Special Law

special law n

1 : local law
2 : a law that applies to a particular place or esp. to a particular member or members of a class of persons or things in the same situation but not to the entire class and that is unconstitutional if the classification made is arbitrary or without a reasonable or legitimate justification or basis called also local law special legislation compare general law

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.