Missouri Implied Consent
Everyone who operates a motor vehicle in the state of Missouri is deemed to have given his or her consent to have his or her breath, blood, urine, or other bodily substances tested for alcohol and/or drugs. This is known as Missouri's "Implied Consent" law. You are presumed to know and understand your rights and responsibilities concerning the testing of your breath or bodily fluids in relation to a DWI arrest.
The arresting officer will choose what type of test to administer. Under Missouri law, however, you are allowed 20 minutes to contact an attorney about whether you should submit to a test. You also have the right to obtain your own test of your body fluids by a physician, qualified technician, chemist, registered nurse or other qualified person after you have submitted to the officer's requested test.