Mississippi Code Title 97. Crimes § 97-23-95

If any person shall commit or attempt to commit the offense of shoplifting, or if any person shall wilfully conceal upon his person or otherwise any unpurchased goods, wares or merchandise held or owned by any store or mercantile establishment, the merchant or any employee thereof or any peace or police officer, acting in good faith and upon probable cause based upon reasonable grounds therefor, may question such person in a reasonable manner for the purpose of ascertaining whether or not such person is guilty of shoplifting as defined herein. Such questioning of a person by a merchant, merchant's employee or peace or police officer shall not render such merchant, merchant's employee or peace or police officer civilly liable for slander, false arrest, false imprisonment, malicious prosecution, unlawful detention or otherwise in any case where such merchant, merchant's employee or peace or police officer acts in good faith and upon reasonable grounds to believe that the person questioned is committing or attempting to commit the crime of shoplifting.