S.C. Code Ann. § 44-17-430

If a person believed to be mentally ill and because of this condition likely to cause serious harm if not immediately hospitalized cannot be examined by at least one licensed physician pursuant to Section 44-17-410 because the person's whereabouts are unknown or for any other reason, the petitioner seeking commitment pursuant to Section 44-17-410 shall execute an affidavit stating a belief that the individual is mentally ill and because of this condition likely to cause serious harm if not hospitalized, the ground for this belief and that the usual procedure for examination cannot be followed and the reason why. Upon presentation of an affidavit, the judge of probate for the county in which the individual is present may issue an order requiring a state or local law enforcement officer to take the individual into custody for a period not exceeding twenty-four hours. The order expires seventy-two hours after it was issued, and if the person is not taken into custody within those seventy-two hours, the order is no longer valid. During the person's detention the person must be examined by at least one licensed physician as provided for in Section 44-17-410(2). The individual taken into custody has the right to representation by an attorney. If within the twenty-four hours the person in custody is not examined by a licensed physician or, if upon examination the physician does not execute the certification provided for in Section 44-17-410(2), the proceedings must be terminated and the individual in custody must be released immediately. Otherwise, proceedings must be held pursuant to Section 44-17-410(3).