Miss. Code Ann. § 47-1-49: Miss. Code Ann. § 47-1-49

In the case of a jail owned jointly by a county and municipality, under the provisions of Section 17-5-1 , the governing authorities of the county and municipality are hereby vested with full and complete authority, jurisdiction and control over such jointly owned jail facility and the governing authority of the municipality may appoint a jailer who shall be responsible for all municipal prisoners lodged in said jail in the same manner in which the sheriff is responsible for state prisoners, and such jailer shall have the same right of access to the jail as the sheriff.