Simple. Passive collection.
You do not go door to door, busting down barracaded houses.
You collect them as the result of other criminal investigations. You got burglarized? “Sir, we need to check the house for evidence.” Domestic violence? Arrest everyone then ransack the house.
Felonies given out every time you find one.
Simple. Passive collection.
I agree that would work in the long-term. I just don’t think they are thinking long-term here. Their goal is in sight and I think that will overrule their normal patterns of incrementalism. They won’t be able to keep it slow either once they reach the edge of their own slippery-slope, it will snowball into an avalanche and they will be lucky if they can keep in front of it. My guess is that they will be over-run by events completely out of their control.