Georgia law gives a person the authority to arrest someone for an offense committed in his presence or "within his immediate knowledge." South Carolina permits basically the same, with an added clause allowing lethal force if the arrest is made at night.
Evans said the law is clear, but "actually executing (it) in public is a very dangerous thing to do." An unnecessary or poorly executed citizen's arrest opens a person to criminal arrest for charges including false imprisonment and simple battery. It could also result in a civil lawsuit if a person is injured.
Evans strongly suggests instead calling law enforcement before taking any action because police have more training and more protection under the law to enforce an arrest.