Only a physician, or a qualified technician, chemist, or registered nurse acting at the request of a law enforcement officer may withdraw blood for purpose of determining the alcohol or drug content therein. This limitation shall not apply to the taking of breath, saliva or urine specimen. The person tested may, at the person’s own expense, have a physician, or a qualified technician, chemist, registered nurse, or other qualified person of his or her own choosing administer a chemical test or tests in addition to any administered at the direction of a law enforcement officer; however, the results of this additional test shall be made available to the Clerk of the Trial Court for purposes of introduction into evidence, without defendant’s consent. The failure or inability to obtain an additional test by a person shall not preclude the admission of the test or tests taken at the direction of law enforcement officer. Upon the request of the person who is tested, full information of the test or tests taken at the direction of the law enforcement officer shall be made available to the person.