Louisiana Revised Statutes Tit. 3, § 4011. Use of other than approved method, equipment, glassware, tests or installation prohibited

A. No person shall use for butterfat analysis in milk or cream any method, equipment, glassware, supplies or electronic analysis device except that which conforms to the United States Bureau of Standards or which shall have been inspected, researched, tested and approved by the commissioner.

B. No method other than the Majonnier, Babcock, or electronic fat analysis device shall be used for butterfat analysis in milk and cream until the method or device shall have been approved by the commissioner. The electronic fat analysis device shall be calibrated by the Babcock method in such manner as shall be defined by rule and regulation.

C. Every installation of laboratory equipment to be used for butterfat analysis in milk and cream shall be inspected and approved by the commissioner. No one shall use an unapproved installation.