An officer may stop a vehicle at a roadside safety check or for probable cause, reasonable suspicion or unusual operation. If the officer suspects the driver is under the influence, the driver is asked to submit to field sobriety tests. If the tests show the officer has probable cause, the driver is arrested for DUI and is taken to the police station and asked to submit to chemical testing of breath, urine or blood. If the driver refuses to submit to or fails to complete testing, or if the test results show a BAC of .08 or more, or any trace of a drug, illegal substance or intoxicating compound, the driver will receive a statutory summary suspension which automatically suspends driving privileges. If someone is charged with DUI for marijuana, the THC now must be quantified. It can be no more than .05 dl if urine tested and .10 dl if tested by blood draw.