The sheriff's office in each county in the state shall enforce the provisions of this article, and the sheriff is authorized and empowered to approve and register such brands and labels intended for use under the provisions of this article as may be submitted to him for that purpose and as may in his judgment conform to the requirements of this article. However, in any prosecution under this article, the fact that any brand or label involved in said prosecution has not been submitted to said sheriff's office for approval, or if submitted, has not been approved by him, shall be immaterial.