3.__Animals subject to examination; scope; request for test.__ An animal entered in an event is subject to examination under the direction of a licensed veterinarian or an agent of the licensed veterinarian.__The licensed veterinarian, with the approval of the commissioner, may appoint technicians and agents to perform duties under this section that are not prohibited by other provisions of law.__The examination may include physical, saliva, urine or blood tests or other tests or procedures that the licensed veterinarian considers necessary to carry out the purposes of this section.__The licensed veterinarian may examine an animal entered in an event if that animal is on the grounds of the event.__The licensed veterinarian also may examine an animal withdrawn by the owner or trainer of the animal within 24 hours prior to an event for which the animal had been entered.

4.__Refusal to submit animal for examination.__An owner or trainer may not refuse to secure or restrain an animal for examination under this section by a licensed veterinarian or a technician or agent of the licensed veterinarian and may not interfere with the restraining or securing of an animal for that examination.

5.__Presence of prohibited substance; prima facie evidence.__ If the chemical analysis of a test performed under subsection 3 indicates the presence of a prohibited substance, it is prima facie evidence that the substance has been administered to the animal.__For purposes of this section, each administration of a prohibited substance to an animal and each occasion on which a prohibited substance was administered in violation of subsection 1 constitutes a separate violation.

6.__Authority of commissioner to make rules.__The commissioner may adopt rules relating to the administration of tests, the care and custody of test samples and all other matters necessary to carry out the purposes of this section. Rules adopted pursuant to this subsection are routine technical rules as defined in Title 5, chapter 375, subchapter 2-A.

7.__Responsibility of owner and trainer for condition of animal; substitute trainer.__In the absence of substantial evidence to the contrary, the owner and trainer of an animal are responsible for the condition of the animal, including the presence of a prohibited substance, and are charged with