Mississippi Code Title 63. Motor Vehicles & Traffic Regulations § 63-11-5

(1)(a) Any person who operates a motor vehicle upon the public highways, public roads and streets of this state shall be deemed to have given his consent, subject to the provisions of this chapter, to a chemical test or tests of his breath, blood or urine for the purpose of determining alcohol concentration. A person shall give his consent to a chemical test or tests of his breath, blood or urine for the purpose of determining the presence in his body of any other substance which would impair a person's ability to operate a motor vehicle.

(b) The test or tests shall be administered at the direction of any authorized officer, when such officer has reasonable grounds and probable cause to believe that the person was driving or had under his actual physical control a motor vehicle upon the public streets or highways of this state while under the influence of intoxicating liquor or any other substance which had impaired such person's ability to operate a motor vehicle.

(2)(a) A breath analysis test must be administered by a person who has met all the educational and training requirements of the appropriate course of study prescribed by the Board on Law Enforcement Officers Standards and Training; however, sheriffs and elected chiefs of police are exempt from the educational and training requirement. A breath analysis test must not be given to any person within fifteen (15) minutes of consumption of any substance by mouth.

(b) For purposes of this section, the term “authorized officer” means any highway patrol officer, sheriff or his duly commissioned deputies, police officer in any incorporated municipality, national park ranger, officer of a state-supported institution of higher learning campus police force if such officer is exercising this authority in regard to a violation that occurred on campus property, or security officer appointed and commissioned pursuant to the Pearl River Valley Water Supply District Security Officer Law of 1978 if such officer is exercising this authority in regard to a violation that occurred within the limits of the Pearl River Valley Water Supply District.