Like any other interstate Compact, the ICAOS inaugurated when state legislatures passed similar statutes enacting the provisions of the agreement. In the case of the ICAOS, the threshold requirement for activation of the Compact was adoption of the Compact by thirty-five states. Unlike some Compacts adopted through Executive Order or by delegation of authority to a state official, ICAOS originated by enacting a substantially similar statute that contained all pertinent provisions of the draft Compact. The following states adopted the ICAOS:

Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Puerto Rico Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Virgin Islands Washington West Virginia Wisconsin Wyoming District of Columbia United States

Ala. Code § 15-22-1-1 (2004) ALASKA STAT. §33-36-3 (2004) ARIZ. REV. STAT. § 31-467 (2004) A.C.A. § 12-51-101 (2004) CAL. PENAL CODE § 11180 (2004) COLO. REV. STAT. §§ 24-60-2802 (2004) CONN. GEN. STAT. § 54-133 (2004) DEL. CODE ANN. tit. 11, §§ 4358 & 4359 (2004) FLA. STAT. ANN. 949-07 (2004) GA. CODE ANN. § 42-9-81 (2004) HAW. REV. STAT. § 353B-1 (2004) IDAHO CODE § 20-301 (2004) 45 ILL. COMP. STAT. 170 (2004) IND. CODE 11-13-4.5 (2004) IOWA CODE § 907B-2 (2004) KAN. STAT. ANN.§ 22-4110 (2004) KY. REV. STAT. ANN. § 439-561 (2004) LA. REV. STAT. ANN. § 15-574-31 (2004) ME. REV. STAT. ANN. tit. 34-A, § 9871, et seq. (2004) MD. CODE ANN. CORRECT. SERV. § 6-201, et seq. (2004) MA GEN L CH 127 SECTION 151a-n (2005) MICH. CONS. LAWS. § 3-1012 (2004) MINN. STAT. ANN. § 243.1605 (2004) MISS. CODE ANN. § 47-7-81 (2004) MO. REV. STAT. § 589.500 (2004) MONT. CODE ANN. § 46-23-1115 (2004) NEB. REV. STAT. § 29-2254 (2004) NEV. REV. STAT. § 213-215 (2004) N.H. REV. STAT. ANN. § 651-A:29 (2004) N.J. STAT. ANN. § 2A:168-26 (2004) N.M. STAT. ANN. § 31-5-20 (2004) N.Y. EXEC. LAW § 259-mm (2004) N.C. GEN. STAT. § 148-4B (2004) N.D. CENT. CODE § 12-65-01 (2004) OHIO REV. CODE §5149-21 (2004) OKLA. STAT. tit. 22 § 1091, et seq. (2004) OR. REV. STAT. §144-600 (2004) 61 PA. CONS. STAT. § 324.1 (2004) (P. del S. 2141), 2004, ley 208 R.I. GEN. LAWS § 13-9.1-1 (2004) S.C. CODE ANN. § 24-21-1100 (2003) S.D. CODIFIED LAWS § 24-24-16A (2004) TCA § 40-28-401 (2004) TEXAS GOV’T CODE ANN. § 510.00, et seq. (2004) UTAH CODE ANN. § 77-28C-103 (2004) VT. STAT. ANN. tit. 22 § 1351 (2004) VA. CODE ANN. §§ 53.1-172 & 53.1-174 (2004) Act No. 6730, Bill No. 26-0003 WASH. REV. CODE § 9-94A-745 (2004) W. VA. CODE § 28-7-1, et seq. (2004) WIS. STAT. § 304-16 (2004) WYO. STAT. ANN. § 7-13-423 (2004) D.C. CODE § 24-133 (2004) Pub. L. No. 73-293, 48 Stat. 909, 4 U.S.C. § 112(A) (2004)

Withdrawal from the Compact is permitted pursuant to Article XII, § A of the agreement. A state may withdraw by enacting a statute specifically repealing the agreement. The effective date of withdrawal is the effective date of the repeal, provided that repealing the agreement does not relieve a state of any pending financial obligations it may have to the Commission. Therefore, a state could not avoid paying assessments, obligations or other liabilities, including any financial penalties imposed by the Commission or a court simply by repealing the agreement. Such obligations would extend beyond the date of any repeal and would be subject to judicial enforcement even after a state has withdrawn from the ICAOS.