January 1, 2013 > Law changes for under the influence testing Law changes for under the influence testing Submitted By Newark PD A new law takes effect January 1, 2013 regarding chemical tests available for people arrested for drug related driving under the influence. Individuals suspected of a drug or a combination of drugs and alcohol DUI, no longer have the option of choosing between a chemical blood test or a urine test to determine the drug content. Persons arrested for drug related driving under the influence will be REQUIRED to submit a chemical blood test ONLY to determine drug content. This law also covers driving under the influence of a prescription drug.