re: Can sheriff deputy

Lowndes County is the only Sheriff's department in Mississippi that can run radar.

Miss. Code Ann. § 63-3-519
It shall be unlawful for any person or peace officer or law enforcement agency, except the Mississippi Highway Safety Patrol, to purchase or use or allow to be used any type of radar speed detection equipment upon any public street, road or highway of this state. However, such equipment may be used:
(a) By municipal law enforcement officers within a municipality having a population of two thousand (2,000) or more according to the latest or a previous federal census upon the public streets of the municipality, but in no case where the latest federal census population for the municipality is less than one thousand five hundred (1,500);
(b) By any college or university campus police force within the confines of any campus wherein more than two thousand (2,000) students are enrolled;
(c) By municipal law enforcement officers in any municipality having a population in excess of fifteen thousand (15,000) according to the latest federal census on federally designated highways lying within the corporate limits.
(d) By municipal law enforcement officers upon the public streets of any incorporated municipality (i) where the county seat is located in the municipality and (ii) where there is a public community college located in the municipality.
The Mississippi Highway Safety Patrol shall be immediately notified by municipal law enforcement of any road blockages or emergencies occurring on any federally designated limited-access highways lying within the corporate limits.