http://billstatus.ls.state.ms.us/documents/2016/pdf/HB/0700-0799/HB0786SG.pdf
1) You can get certain immunities:
shall be immune from civil
liability for any action taken by a member of the security program
if the action in question occurs during the reasonable exercise of
and within the course and scope of the member's official duties as
a member of the security program for the church or place of
worship.
IF you have a license:
(b) In order to be eligible for the immunity provided
in this section:
(i) The program at a minimum must require that
each participant of the program possesses a firearms permit issued
under Section 45-9-101 and has completed an instructional course
in the safe handling and use of firearms
2) But as for needing a license to carry:
45-9-101. (1) (a) Except as otherwise provided, the
Department of Public Safety is authorized to issue licenses to
carry stun guns, concealed pistols or revolvers to persons
qualified as provided in this section...
...
Now amended as follows, it seems without connection to a church security program!:
A license * * * under this section is not
required for a loaded or unloaded pistol or revolver to be carried
upon the person in a sheath, belt holster or shoulder holster or
in a purse, handbag, satchel, other similar bag or briefcase or
fully enclosed case if the person is not engaged in criminal
activity other than a misdemeanor traffic offense, is not
otherwise prohibited from possessing a pistol or revolver under
state or federal law, and is not in a location prohibited under
subsection (13) of this section.
3) And justification now includes:
97-3-15. (1) The killing of a human being by the act,
procurement or omission of another shall be justifiable in the
following cases:
(i) When necessarily committed in the performance of
511 duty as a member of a church or place of worship security program
512 as described in Section 1 of this act.