Texas Education Code - EDUC § 21.102. Probationary Contract

(a) Except as provided by Section 21.202(b), a person who is employed as a teacher by a school district for the first time, or who has not been employed by the district for two consecutive school years subsequent to August 28, 1967, shall be employed under a probationary contract.  A person who previously was employed as a teacher by a district and, after at least a two-year lapse in district employment returns to district employment, may be employed under a probationary contract.

(a-1) A person who voluntarily accepts an assignment in a new professional capacity that requires a different class of certificate under Subchapter B than the class of certificate held by the person in the professional capacity in which the person was previously employed may be employed under a probationary contract.  This subsection does not apply to a person who is returned by a school district to a professional capacity in which the person was employed by the district before the district employed the person in the new professional capacity as described by this subsection.  A person described by this subsection who is returned to a previous professional capacity is entitled to be employed in the original professional capacity under the same contractual status as the status held by the person during the previous employment by the district in that capacity.

(b) A probationary contract may not be for a term exceeding one school year.  The probationary contract may be renewed for two additional one-year periods, for a maximum permissible probationary contract period of three school years, except that the probationary period may not exceed one year for a person who has been employed as a teacher in public education for at least five of the eight years preceding employment by the district.

(c) An employment contract may not extend the probationary contract period beyond the end of the third consecutive school year of the teacher's employment by the school district unless, during the third year of a teacher's probationary contract, the board of trustees determines that it is doubtful whether the teacher should be given a continuing contract or a term contract.  If the board makes that determination, the district may make a probationary contract with the teacher for a term ending with the fourth consecutive school year of the teacher's employment with the district, at which time the district shall: