S.C. Code Ann. § 56-5-2930
(A) It is unlawful for a person to drive a motor vehicle within this State while under the influence of alcohol to the extent that the person's faculties to drive a motor vehicle are materially and appreciably impaired, under the influence of any other drug or a combination of other drugs or substances which cause impairment to the extent that the person's faculties to drive a motor vehicle are materially and appreciably impaired, or under the combined influence of alcohol and any other drug or drugs or substances which cause impairment to the extent that the person's faculties to drive a motor vehicle are materially and appreciably impaired. A person who violates the provisions of this section is guilty of the offense of driving under the influence and, upon conviction, entry of a plea of guilty or of nolo contendere, or forfeiture of bail must be punished as follows:
(I) A person charged for a violation of this section may be prosecuted pursuant to Section 56-5-2933 if the original testing of the person's breath or collection of other bodily fluids was performed within two hours of the time of arrest and reasonable suspicion existed to justify the traffic stop. A person may not be prosecuted for both a violation of this section and a violation of Section 56-5-2933 for the same incident. A person who violates the provisions of this section is entitled to a jury trial and is afforded the right to challenge certain factors including the following:
(4) whether the person consented to taking a test pursuant to Section 56-5-2950, and whether the:
(J) Nothing contained in this section prohibits the introduction of:
(2) any evidence that may corroborate or question the validity of the breath or bodily fluid test result including, but not limited to:
(4) any other evidence of the state of a person's faculties to drive a motor vehicle which would call into question the results of a breath or bodily fluid test.
At trial, a person charged with a violation of this section is allowed to present evidence relating to the factors enumerated above and the totality of the evidence produced at trial may be used by the jury to determine guilt or innocence. A person charged with a violation of this section must be given notice of intent to prosecute under the provisions of this section at least thirty calendar days before his trial date.