California law enforcement officers now possess the tools and wherewithal they need to crack down on drivers that consume cannabis. On St. Patrick’s Day weekend, San Diego Police Department began using two Dräger DrugTest 5000 machines which detect for a total of seven drugs. The San Diego Police Department is the first law enforcement agency to use the tests in San Diego County.

The Dräger DrugTest 5000 machines utilize an oral swab for drug detection. The drivers will be given a mouth swab to rub inside their mouth and hold for around four minutes. Then the swab is placed in a solution, and the machines print out a toxicology report. The tests, however, cannot determine the level of intoxication. Instead, they merely detect the presence of any drug metabolites. Those who test positive for cannabis or other drugs will be required to undergo a blood test, which can determine the level of intoxication. New technology enables the tests to detect the presence of cannabis.

The policy mirrors California’s state alcohol laws. Like a DUI, California drivers reserve the right to refuse to take the Dräger 5000 test, however, if the police officer believes there are grounds for reasonable suspicion, the driver may be forced to provide a blood sample.

The main concern law enforcement fears is the implementation of recreational cannabis approaching next January. “The message we are sending is simply this: Do not drive while impaired by alcohol, impaired by drugs or a combination of both,” San Diego Police Chief Shelley Zimmerman told NBC 7. “And if you choose to make the wrong decision to drive while under the influence and impaired by drugs, this technology is another tool we will use to find you, arrest you and prevent you from endangering our community.”

The drug test has already made its debut in Australia, Belgium and Germany and a handful of other states where cannabis is legal since it was invented in 2009. If you’re planning on smoking in San Diego County, do yourself a favor and assign a designated driver.