It is important to note that when you apply for a driver’s license in California, you are considered to have provided implied consent to giving a blood or urine sample for testing. So, if you are pulled over and suspected of driving under the influence of drugs, you have already agreed to submit to a urine or blood test if you have a driver’s license. Because blood draws are considered a “search” under the U.S. Constitution, you can refuse it; however, refusing to submit to the test may result in a warrant being issued to take a “forced blood draw” and additional, harsher consequences in court and with DMV will result.