Flight can be prevented by surrounding the building. Attempts to shoot officers can be mitigated by a deliberate clearing strategy. As for crooks destroying evidence, I have a simple strategy for that: have a cop show up at the door, knock, wait for the sound of flushing followed by someone opening the door. When someone answers, show them some mug shots of suspects seen in the neighborhood and ask the person if they've seen them. No warrant required, and no risk if the wrong house is visited. Once the sounds of flushing no longer precede the opening door, assuming the dealer's boss hasn't gotten steamed about the trashed inventory, then the police can conduct a proper search.
s know knock raid is based on information that is made available to them before hand. It is very tragic what happened to this lady but I can't see blaming the police for doing exactly what they were trained to do. If these cops knew ahead of time that their is a strong possibility that numerous weapons are inside of the apartment, then why make the raid more dangerous by knocking first and then entering....believe it or not, no knock raids probably save more lives and that includes the suspects as well.
How dangerous have seige raids been back when they were the normal method of getting holed-up criminals?