Ala. Code § 45-18-120.09: Probationary Employment.

All appointments, other than temporary appointments, shall be probationary for six months from the date of appointment. A probationary employee may be discharged by his or her appointing authority at his or her or its pleasure at any time before the expiration of six months from appointment. After he or she shall have served for six months in the position to which he or she was appointed or employed, such employee shall become a merit employee.