Wrong on both counts. No knock. And they supposedly announced police as they were busting the door open and shooting the dog. As if anyone could sort those things out in that kind of mayhem. That's the PD version which has been released. Of course, the occupants will never get to tell their side. Why not just call them and tell them they were outside with a warrant and that they should come out?
They admitted not knocking? Odd that they'd announce they were police without knocking first. But, they had a legal right to be there. And, the shooting only began when the officers were attacked by pit bull.
The couple in question was found to possess not only marijuana but either cocaine or another white powder drug. So, they were likely high out of their minds.