(a) Upon the trial of any civil, criminal, or quasi-criminal action or proceeding arising out of acts alleged to have been committed by any person while driving or in actual control of a vehicle while under the influence of alcohol or controlled substance, evidence of the amount of alcohol or controlled substance in a person's blood at the alleged time, as determined by a chemical analysis of the person's blood, urine, breath, or other bodily substance, shall be admissible. Where such a chemical test is made the following provisions shall apply:

(1) Chemical analyses of the person's blood, urine, breath, or other bodily substance to be considered valid under the provisions of this section shall have been performed according to methods approved by the Department of Forensic Sciences and by an individual possessing a valid permit issued by the Department of Forensic Sciences for this purpose. The court trying the case may take judicial notice of the methods approved by the Department of Forensic Sciences. The Department of Forensic Sciences is authorized to approve satisfactory techniques or methods, to ascertain the qualifications and competence of individuals to conduct such analyses, and to issue permits which shall be subject to termination or revocation at the discretion of the Department of Forensic Sciences. The Department of Forensic Sciences shall approve permits required in this section only for employees of state, county, municipal, and federal law enforcement agencies and for laboratory personnel employed by the Department of Forensic Sciences.

(2) When a person shall submit to a blood test at the direction of a law enforcement officer under the provisions of Section 32-5-192, only a physician or a registered nurse (or other qualified person) may withdraw blood for the purpose of determining the alcoholic content therein. This limitation shall not apply to the taking of breath or urine specimens. If the test given under Section 32-5-192 is a chemical test of urine, the person tested shall be given such privacy in the taking of the urine specimen as will insure the accuracy of the specimen and, at the same time, maintain the dignity of the individual involved.

(3) The person tested may at his or her own expense have a physician, or a qualified technician, registered nurse or other qualified person of his or her own choosing administer a chemical test or tests in addition to any administered at the discretion of a law enforcement officer. The failure or inability to obtain an additional test by a person shall not preclude the admission of evidence relating to the test or tests taken at the direction of a law enforcement officer.

(4) Upon the written request of the person who shall submit to a chemical test or tests at the request of a law enforcement officer, full information concerning the test or tests shall be made available to him or her or his or her attorney.

(5) Percent by weight of alcohol in the blood shall be based upon grams of alcohol per 100 cubic centimeters of blood or grams of alcohol per 210 liters of breath.

(b) Upon the trial of any civil, criminal, or quasi-criminal action or proceeding arising out of acts alleged to have been committed by any person while driving or in actual physical control of a vehicle while under the influence of alcohol, the amount of alcohol in the person's blood at the time alleged as shown by chemical analysis of the person's blood, urine, breath, or other bodily substance shall give rise to the following presumptions:

(1) If there were at that time 0.05 percent or less by weight of alcohol in the person's blood, it shall be presumed that the person was not under the influence of alcohol unless the person was operating a motor vehicle in performance of his or her duties as a school bus driver or day care driver at that time or was under the age of 21 years at that time.

(2) If there were at the time in excess of 0.05 percent but less than 0.08 percent by weight of alcohol in the person's blood, such fact shall not give rise to any presumption that the person was or was not under the influence of alcohol, but such fact may be considered with other competent evidence in determining whether the person was under the influence of alcohol unless the person was operating a motor vehicle in performance of his or her duties as a school bus driver or day care driver at that time or was under the age of 21 years at that time.

(3) If there were at that time 0.08 percent or more by weight of alcohol in the person's blood, or greater than .02 percent if the person was operating a motor vehicle in performance of his or her duties as a school bus driver or day care driver at that time or was under the age of 21 years at that time, it shall be presumed that the person was under the influence of alcohol.

(4) The foregoing provisions of this subsection shall not be construed as limiting the introduction of any other competent evidence bearing upon the question whether the person was under the influence of alcohol.

(c) If a person under arrest refuses to submit to a chemical test under the provisions of Section 32-5-192, evidence of refusal shall be admissible in any civil, criminal, or quasi-criminal action or proceeding arising out of acts alleged to have been committed while the person was driving or in actual physical control of a motor vehicle while under the influence of alcohol or controlled substance.

(d) No physician, registered nurse, or duly licensed chemical laboratory technologist or clinical laboratory technician or medical facility shall incur any civil or criminal liability as a result of the proper administering of a blood test when requested in writing by a law enforcement officer to administer such a test.