Alabama Code Title 45. Local Laws § 45-41-82.01

A. No person, acting either for himself or as agent or otherwise, shall require any of his employees to sign contracts by which the employees shall forfeit their wages if discharged before the contract is completed or if the employees resign their employment before the contract is completed;  but in all such cases the employees shall be entitled to the wages actually earned up to the time of their discharge or resignation.

B. Nothing in Subsection A of this Section or in R.S. 23:631(A) shall prohibit an employer from requiring an applicant for employment who becomes an employee or an employee, provided the employee is compensated at a rate equivalent to not less than one dollar above the existing federal minimum wage and is not a part-time or seasonal employee as defined in R.S. 23:1021, to sign a contract providing that the costs of such individual's preemployment medical examination or drug test may be withheld from his wages if he resigns within ninety working days from his first day of work, and, upon resignation, withholding such costs, unless such resignation is attributable to a substantial change made to the employment by the employer as applied in the Louisiana Employment Security Law.