C.R.S. § 34-53-102

Any person, association, or corporation, or the agent of any person, association, or corporation, engaged in the business of milling, sampling, concentrating, reducing, shipping, or purchasing ores who keeps or uses any false or fraudulent scales or weights for weighing ore, or who keeps or uses any false or fraudulent assay scales or weights for ascertaining the assay value of ore, knowing them to be false, commits a class 2 misdemeanor.