Thanks - that is interesting, but it still seems incorrect. The mask mandate was left up to cities and counties (never state-wide) and I am unaware of any enforcement (fines, etc.) I may be wrong, but it seemed to me that most people were already wearing masks.
Crediting the June 29 closures of certain businesses is more troubling.
AZ's Rt was below one on June 24, so the spread was already slowing. As for the closures, themselves, they struck me as "feel good" measures. Throughout the pandemic restaurants and bars have been singled out as especially dangerous, yet the June 29 closures would have only made the situation worse: restaurant bars were able to continue operating, so people who couldn't go to their own tavern, started cramming into restaurant bars. Arizona has been open about the lack of resources in the area of enforcement, so it strikes me as extremely unlikely that a restaurant operating at over 50% capacity would be on anyone's RADAR. It's also interesting that the June 29 limiting of restaurants to 50% has been credited, even though they had been so limited since the initial reopening on May 11.
Something happened in AZ that resulted in a spike that dropped as quickly as it climbed - I still wish there was a serious effort to find out how and why.