There are also some issues with relation back testimony in AZ due to the fact AZ is now a Daubert state. There may be some legal arguments to make depending in the method used by the state's expert to do the retrograde
This refers to the method by which a forensic toxicologist attempts to calculate what your BAC was at the time of driving. I'd suggest consulting with a private DUI attorney in AZ about your case, as it might give you a better chance of winning. Good luck.