When stopped for dui test the officer must charge you with a violation then , not six months later and put out a warrant
was stopped for dui test ,then take to police station for blood test, then released on same night with no ticket but an impounded car. Never received a ticket or summons. then was traveling with friend when a diabetiic episode happen when he was driving . the officer who assisted the driver did a background check on everyone and said there was arrest warrnt for me and took me to the city jail then the county. when arrained before the judge she released me on my own recognizance because i had never received the summons , the court records had shown that the summons had been mailed but returned because the summons had been returned as not delivered. the start of this began in september 2008 the arrest warant and ticket were issued in nayof 2009
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Each State is different, but there is no requirement that I am aware of in any state that requires that charges be filed on the date of the offense, except maybe a traffic ticket. It sounds to me like the officer chose to wait on the results of the blood test before deciding whether he would file the DWI charges against you. Once they came in (it can take months at a state lab), he filed the charge and a warrant was issued for your arrest.
Typically, the only limit on how long he may wait to do so is the Statute of Limitations. In Texas, the Statute of Limitation son misdemeanors is two (2) years. In other words, if he had arrested you on September 1, 2008, the State would simply have to file their charges before September 1, 2010, and there is no problem there.
The Statute of Limitations will vary from state to state, but I would be shocked if six to eight months was too long to file the charges. You will want to consult with an Arizona lawyer about this, but I would strongly recommend that you get yourself a lawyer who is experienced with DWI defense, especially for a breath- or blood-test case. It's a different animal, and you want someone who knows the area well.
Like the previous answer suggested, the state can ordinarily file a criminal charge any time within the statute of limitations.
In your case, since they could not get the summons to you due to a problem with delivery, the only thing they can really do is issue a warrant for you so that you will end up in court to answer the criminal charges against you.