Miss. Code § 47-7-23
Except as otherwise provided by law, the Department of Corrections shall have the power and duty to make rules for the conduct of persons heretofore or hereafter placed on parole under the supervision of the Department of Corrections and for the investigation and supervision of such persons, which supervision may include a condition that such persons submit, as provided in Section 47-5-601, to any type of breath, saliva or urine chemical analysis test, the purpose of which is to detect the possible presence of alcohol or a substance prohibited or controlled by any law of the State of Mississippi or the United States. The department shall not make any rules which shall be inconsistent with the rules imposed by the State Parole Board pursuant to Section 47-7-17 on offenders who are placed on unsupervised parole.
Miss. Code § 47-7-23