Having your matter set aside is different than having your arrest record cleared. Because you have no conviction on your record, there is nothing to set aside. This is probably why your motion was denied.
You can however, request that your arrest record be cleared pursuant to A.R.S. §13-4051. Under this statute, any person who is wrongfully arrested, indicted or otherwise charged for any crime may petition court for entry upon all court records, police records and any other records of any other agency relating to such arrest or indictment a notation that the person has been cleared.
If you would like assistance in filing this motion with the court please feel free to contact me. Good luck.
Nothing in this web post constitutes legal advice. If you have a legal question please see my main site at <a href="www.dmcantor.com">Phoenix DUI and Criminal Lawyer David M Cantor</a> or call 602-307-0808.
My colleague provides an accurate, detailed answer to your question. You should give it a try however understand that these requests are rarely granted. But you've got little to lose and much to gain.