I agree It looks like Pima county really screwed-the-pooch on this & are now circling the wagons. It seems clear to me that At THE VERY LEAST it requires a completely un-biased investigation by an outside agency, preferably a Federal Grand Jury. That would take it out of the hands of the LEO crowd, while insuring that it came from a higher level. Also, until the investigation is complete, I would require that all SWAT activity cease. I think this also brings into question the teams' certification.
P.S. SWAT action for a marijuana bust?
Here's one more thought. The concept of announcing you're the Police virtually as you break in doesn't give the resident time to verify the ID. That on the surface calls into question whether the police have indeed given proper ID. I understand that it gives the bad guys more time to prepare/flush/etc. but the constitution is founded on the principles of protecting the citizens from over-zealous government!
If this turns out to be as it appears, I hope some heads roll over it-and I'm not speaking metaphorically. It would seem to be at least manslaughter!