pmich - why would you be taking a blood or any other test to drive?
That asked, Oxycodone, depending on the amount taken, can stay in the system anywhere from 3 days to 3 weeks via a blood test. There are tests now in place, however, that can determine drug use up to 80 days. These new blood tests are so sensitive they can pick up alcohol ingested even from the use of mouthwash. There are also hair strand tests being done now that can tell if someone has used drugs up to 6 months back. This test even picks up alcohol usage, however slight.
Still curious what one (testing) has to do with the other (driving)?