The commissioner and the commissioner’s assistants, inspectors, agents, and employees, shall also have power and authority, in their discretion, to render unsalable for use as food, any food the sale or use of which is now or hereafter prohibited by law, or which is manufactured, sold, used, transported, offered for sale or transportation, or had in possession with intent to use, sell, or transport in violation of any provision thereof, or in violation of any provision of any rule, definition, standard, or ruling made, adopted, and published thereunder, and the commissioner and assistants, inspectors, agents, and employees shall be exempt from liability for any such action. The test of the condition of any such food shall be its condition at the time of discovery. Any reasonable and necessary means may be adopted for rendering such food unsalable for use as food.