Tenn. Code Ann. § 53-3-102: Construction of chapter

(a) The word "shall" is mandatory, and the word "may" is permissive.

(b) Wherever a tolerance is allowed, it shall apply only to a tolerance as to composition and not to weight, unless specifically stated.

(c) Whenever any reference is made to any section in this chapter or to any other law, the reference shall apply to all amendments and additions to the section or other law.