Ala. Code § 17-17-40

Any qualified elector at any election who takes or receives any money or other valuable thing, upon the condition that the same shall be paid at any future time, in exchange for the vote of such elector for any particular candidate, or the promise to vote for any particular candidate, shall be guilty, upon conviction, of a Class C misdemeanor. No witness shall be prosecuted for any offense under this section as to which he or she testified before the grand jury.