The cops never raid the Korbe home in the first place. They approach Robert Korbe at work, or as he’s about to enter or exit his house.
This would be the use of routine police work in place of a SWAT raid. Balko is spot on in this commentary. The only argument against arrests outside of the place where the evidence is supposed to be stored is that the evidence might be destroyed by an accomplice.
The no-knock warrant flies in the face of modern CQB doctrine. You only conduct an entry that requires a highly discretionary application of force when there is something inside worth risking the lives of all involved. A SWAT officer might willingly die to save a child that has be kidnapped, but I don’t know any that would be willing to lay down their life to seize a small drug stash or to arrest a street level dealer.
Even if an accomplice flushes the drugs, isn’t that the fastest way of getting the drugs off of the street?