Any law to the contrary notwithstanding, any retailer, who relies in good faith on any state sales tax exemption number that has been authorized by the state Revenue Department and the exemption claim has been made on a form provided or approved for use by the Revenue Department, when a state tax exemption number holder violates the tax exempt privilege or uses such number illegally, shall not subsequently be liable to the state Revenue Department or others for the sales tax on purchases.
Ala. Code § 40-23-120 (1975)