[WillAdams]

One approach for this is that the person who makes the call needs to be on-site and in the front of the situation --- similarly, a judge signing off on a No-Knock Warrant --- the judge needs to be at least be present, and should be required to walk through the building/home/apartment after the warrant is served. If it's not important/severe enough for a judge to do this, then I would argue that there's no need for the "no knock" aspect.