Tennessee Code Title 8. Public Officers and Employees § 8-10-102

(C)(i) Any person holding the office of constable on or before June 30, 2011, shall be able to read and write;

(ii) Any person elected or appointed to the office of constable on or after July 1, 2011, shall possess at least a high school diploma or high school equivalency credential approved by the state board of education; provided, however, that this subdivision (a)(1)(C)(ii) shall not apply to any person holding the office of constable on June 30, 2011, and who is re-elected to the office of constable on or after July 1, 2011, without any interruption in holding such office;

(E)(i) Not have been separated or discharged from the armed forces of the United States with other than an honorable discharge.

(ii) This subdivision (a)(1)(E) does not apply to any county having a population of not less than eighteen thousand two hundred (18,200) nor more than eighteen thousand five hundred (18,500), according to the 1990 federal census or any subsequent federal census, if a person has served in the office of constable for ten (10) or more years.

(i) An affidavit signed by the candidate affirming that the candidate meets the requirements of this section. In the event that the candidate seeks election to the office of constable by the county legislative body to fill a vacancy in office, the same affidavit must be filed with the county clerk prior to the election; and

(ii) A letter from a psychologist licensed in this state who has conducted a cognitive and psychological test on the candidate stating that the candidate is mentally and cognitively fit to perform the duties of a constable. In the event that the candidate seeks election to the office of constable by the county legislative body to fill a vacancy in office, the same letter must be filed with the county clerk prior to the election.