I have a better way to deal with this street vermin. Truck in to a site close by loads of the prefab fencing, nine feet high, topped with razor wirte. When eleven o’clock night arrives, connect the fence sections all the way around the vermin and place bio-hazard suited guards outside the wire with DDT sprayers and then a row of bio-hazard scrubber tents. If any want to leave, they can come out one by one, be sprayed and washed, then dressed and bussed to Mexico. Let the vermin enjoy their scabbies and STDs for a week or two without treatment. Just toss MREs over the fence to the wild things.
That's just what I was thinking the other day.