YES! If you are under arrest and transported to the station for processing, the Officer must have probable cause to request a breath sample from you. Once at the station, you MUST provide a breath sample, even if you (erroneously) believe that you should not.  In Alaska, when you receive your driver's license from the DMV, you must sign a document that requires you to provide a breath sample during a DUI investigation. In Alaska, a DUI and Refusal charge have mirroring penalties.  This means that it is very difficult to defend a Refusal/DUI case because the DA isn't required to dismiss the Refusal charge should that person litigate their case before a Jury.