The Governor may, at his discretion, appoint such additional deputies, constables, security guards and detectives as he may deem necessary to assist in the detection of crime and the enforcement of any criminal laws of this State, the qualifications, salaries and expenses of such deputies, constables, security guards and detectives appointed to be determined by and paid as provided for by law. Appointments by the Governor may be made hereunder without compensation from the State. Any appointments of deputies, constables, security guards and detectives made without compensation from the State may be revoked by the Governor at his pleasure. All appointments of deputies, constables, security guards and detectives hereunder without compensation shall expire sixty days after the expiration of the term of the Governor making such appointment. Each Governor shall reappoint all deputies, constables, security guards and detectives who are regularly salaried as provided for by law within sixty days after taking office unless such deputy, constable, security guard or detective is discharged with cause as provided for by law. All persons appointed under the provisions of this section shall be required to furnish evidence that they are knowledgeable as to the duties and responsibilities of a law-enforcement officer or shall be required to take such training in this field as may be prescribed by the chief of the South Carolina Law-Enforcement Division.