2021 Tennessee Code
Part 2 - Criminal Investigators and Assistant District Attorneys General—compensation
§ 8-7-230. Salaries of Criminal Investigators

Entry level $ 33,852
after two (2) years  36,924
after four (4) years  39,972
after six (6) years  43,032
after eight (8) years  46,164
after ten (10) years  49,188
after twelve (12) years  52,320
after fourteen (14) years  55,332
after sixteen (16) years  58,428
after eighteen (18) years  61,512
after twenty (20) years  64,584