Vehicles: driving under the influence: drug testing.

Existing law provides that a person who drives a motor vehicle is deemed to have given his or her consent to chemical testing of his or her blood for the purpose of determining the drug content of his or her blood, if lawfully arrested for driving under the influence of alcohol or drugs. Existing law provides that if a blood test is unavailable, the person shall be deemed to have given his or her consent to chemical testing of his or her urine and shall submit to a urine test. Existing law authorizes an officer to use a preliminary alcohol screening test that indicates the presence or concentration of alcohol based on a breath sample as a further investigatory tool in order to establish…