Depends on the test.Swab yes, saliva probably not, most roadside tests are saliva, airports and popos do swabs.Urine and blood probably not.
On a related note if you or anybody else is looking to beat saliva tests used by police EU-wide I have a guranteed solution, engineered specifically to beat these tests.Comes on a tiny paper that dissolves in the mouth, very discreet and result is always NEGATIVE, get in touch.
Currently working to put something together as proof to sell it public here on BB but meanwhile I can personally guarantee to it's efficacy and welcome any test, my solution is unique in the world.