the dispatcher might very well be misinformed as well. they just process requests from command and inform the field units. their job does not entail verifying the pedigree of orders beyond if they came from an official channel.
the person with the gun on the other hand is the one trained in use of force, firearms safety, etc. it doesn't matter WHERE they are because they are trained on the rules of engagement that are always true regardless of where he is.
> no-knocks
these are a product of the war on drugs, so are illigitimate by default.
this is to say nothing of the fact that they are intentionally scheduled at times to optimize disorientation of civilians, whom are then expected to act in a beyond professional capacity against trained executioners.