20 ILCS 1807/149
Any person subject to this Code who commits an offense not enumerated in this Code, but which is an offense under the laws of the United States, the laws of this State, or the laws of another state, U.Commonwealth, Territory, Possession, or District, while said person is subject to the jurisdiction of this Code under Article 2, is guilty of any act or omission which, although not made punishable by any enactment of this State, is punishable if committed or omitted within the jurisdiction of the laws of the United States, the laws of this State, or the laws of another state, Territory, Possession, or District, and said offense may be charged as an offense under Article 134 of this Code pursuant to the substantive law of the jurisdiction where the offense was committed, in force at the time of said offense, and shall be punished pursuant to said other law, subject only to the maximum punishment prescribed by this Code.
20 ILCS 1807/149