S.C. Code § 19-9-40
If at a hearing the judge determines that the witness is material and necessary, that it will not cause undue hardship to the witness to be compelled to attend and testify in the prosecution or grand jury investigation in the other state and that the laws of the state in which the prosecution is pending or grand jury investigation has commenced or is about to commence and of any other state through which the witness may be required to pass by ordinary course of travel, will give to him protection from arrest and the service of civil and criminal process, he shall issue a summons, with a copy of the certificate attached, directing the witness to attend and testify in the court in which the prosecution is pending or in which a grand jury investigation has commenced or is about to commence at a time and place specified in the summons. In any such hearing the certificate shall be prima facie evidence of all the facts stated therein.
S.C. Code § 19-9-40