The consequences of refusing mandatory testing depend on the type of test. Refusing a field sobriety test, which is used to determine if a person is driving under the influence, is voluntary and completion of the test is not required under the law. However, if a driver refuses a field sobriety test, they may be asked to undertake a chemical test to determine their blood alcohol level. Refusing a chemical test, on the other hand, can result in heavy fines, license suspension, mandatory ignition interlock device (IID) installation, and even jail time. Additionally, almost every state imposes a mandatory driver’s license suspension on the driver who refuses to complete a chemical test. If a driver who refuses a test is later found guilty of a DUI, the refusal can be considered by the court in determining whether to impose heightened punishment on the driver for the DUI.