[update: the legislative session ended and the repeal was not enacted. In other words, the interlock will be required for all DUI offenders. Rep. John Kavanagh had a lengthy letter advocating repeal in the Tucson Citzen]
Earlier in this legislative season, AZ lawmakers passed and the governor signed a bill that requires a DUI ignition interlock device be installed for any DUI conviction. Previously interlocks were required only on repeat DUI offenders, or extreme-DUI convictions. A new bill/amendment has been introduced which would reverse the interlocks for first-time offenders. (it would be unusual to pass and rescind a law in the same legislative session)
There seems to be endless legislative fiddling with DUI penalties.