When a person is arrested in Arizona for driving under the influence (DUI), and a blood sample is drawn, the arresting officer is required to advise the person that they may have an independent test of their blood performed. However, in Arizona it is very difficult to find a facility willing to draw blood after business hours (typically when a DUI arrest occurs), and test it for alcohol concentration. By the time the person finds such a facility, secures transportation to that facility, and waits for blood to be drawn, many hours have passed. Due to the fact that alcohol disappears from one’s system over time, this is can be an important issue.