The consequences of refusing to submit to a blood, breath or urine test varies according to the state. Generally, there are three adverse results:

1. Your driver's license will be suspended for a period of time, commonly three, six or twelve months. This is true even if you are found not guilty of the DWI charge.
2. In some states, refusal is a separate crime; in others, it adds jail time to the sentence for the DWI offense.
3. The fact of refusal can be introduced into evidence as "consciousness of guilt". Of course, the defense is free to offer other reasons for the refusal.

Thus, the decision is one of weighing the likelihood of a high blood-alcohol reading against the consequences for refusing.