Answer: The roadside breath test is called a portable Alco-Sensor. It can only be used in court to tell if that person is either positive or negative for alcohol. And what happens is, if they refuse that, all that can be used against them is that the officer can say is they chose not to take the test. All those tests are voluntary. It’s not used against you in court because it is not an accurate or scientifically accurate test. The officers will sometimes rely upon it as in addition to relying upon other guilt sobriety evidence, and it’s voluntary.