Ala. Code § 22-21A-9

Any member state may withdraw from this compact by adopting a law to that effect, but no such withdrawal shall take effect until six months after the governor of the withdrawing member state has given notice of the withdrawal to the other member states. A withdrawing state shall be liable for any obligations that it may have incurred prior to the date on which its withdrawal becomes effective. This compact shall be dissolved upon the withdrawal of all but one of the member states.