Idaho Code § 25-608: Identification of tested animals.

It shall be the duty of all veterinarians in the state of Idaho, at the time of taking a blood sample from any animal for the purpose of having such blood sample tested for brucellosis, to record the number of the official eartag or other official identification, if present or affix an official metal eartag bearing a number of identification on the right ear of said animal, or affix other official identification to the animal, except that in the case of registered cattle or other animals a legible tattoo number may suffice for identification.