Amends the Juvenile Court Act of 1987 and the Code of Criminal Procedure of 1963. Provides that an oral, written, or sign language statement of a minor, who at the time of the commission of the offense was under 18 years of age, made as a result of a custodial interrogation conducted at a police station or other place of detention on or after the effective date of the amendatory Act shall be presumed to be inadmissible