S.C. Code Ann. § 17-30-125
(A) The supervising agent of the South Carolina Law Enforcement Division or the supervising law enforcement officer of a political subdivision of this State at the scene of an incident where there is reasonable cause to believe:
(4) that a person has barricaded himself and is armed and is threatening suicide;
may order law enforcement or telephone company personnel to cut, reroute, or divert telephone lines solely for the purpose of preventing telephone communications between the suspect and any person other than a law enforcement officer or the law enforcement officer's designee, if the cutting, rerouting, or diverting of telephone lines is technically feasible and can be performed without endangering the lives of telephone company or other utility personnel.