https://www.sccourts.org/courtReg/displayRule.cfm?ruleID=404.0&subRuleID=&ruleType=APP

This rule applies to attorneys authorized to practice laws in other states who wish to appear pro hac vice in South Carolina. The rule addresses application procedures, fees and attorney conduct and responsibilities. A non-South Carolina lawyer may perform legal services on three or fewer matters in the course of a calendar year "if those services are in or reasonably related to a pending or potential arbitration, mediation, or other alternative dispute resolution proceeding in this or another jurisdiction, if the services arise out of or are reasonably related to the lawyer's pre-existing representation of a client in a jurisdiction in which the lawyer is admitted to practice."