For many cases you may have a valid defence and reasonable chance of being acquitted. The police must follow certain rules when arresting a person and taking samples of breath or blood. If the police did not follow those rules, the results can be excluded resulting in the charges being dismissed. Also, every citizen has constitutional rights. If the police violated those rights, the court can exclude the evidence resulting in the charges being dismissed. Given the severe penalties for being convicted of an impaired driving related offense, you should consult with a lawyer who is experienced in defending these types of cases before you agree to plead guilty.