There is no need for no-knock raids, unless they are dealing with a fortress type situation.
A person cannot possibly protect themselves from the criminal element, if the expectation is that a homeowner must be expected to put down his arms if somebody tells, “Police”!
Furthermore, if the quantity of drugs can be quickly flushed, then you're pretty small-time.
There's two types of drug dealers; those who need forklifts and those who don't.