Amends the Criminal Identification Act. Provides that a petitioner may petition the circuit court to expunge the records of his or her arrests and charges not initiated by arrest when each arrest or charge not initiated by arrest sought to be expunged resulted in: (1) an order of misdemeanor diversion under the Unified Code of Corrections, and the diversion program was successfully completed by the petitioner; or (2) a conviction for possession of certain specified amounts of a controlled substance; (3) a conviction for possessing less than 5 grams of methamphetamine; or (4) a conviction where the statutory penalty changed as a result of a resentencing hearing under the Code of Criminal Procedure of 1963. Amends the Illinois Controlled Substances Act. Changes the penalties for the manufacture, delivery, or possession with intent to manufacture or deliver, or possession of a controlled substance. Amends the Methamphetamine Control and Community Protection Act. Changes the penalties for methamphetamine delivery or possession. Amends the Code of Criminal Procedure of 1963. Provides that a person serving a sentence, including a sentence of probation, for an offense for which the statutory penalty has been subsequently reduced under the amendatory Act to petition the trial court that entered the judgment of conviction to request resentencing in accordance with the statutory penalty in effect at the time of the filing of the petition. Amends the Unified Code of Corrections to create a Misdemeanor Diversion Program.