I wonder if that was a direct dig at illegals because when I use to drive a taxi in New york city years ago we had a huge problem with drivers with questionable legal status constantly peeing in bottles and a lot of times spilling it which would make the cab unusable from the stink. These guys were obsessed with freakin bottles and pee, I’d find them all over the place, under the seat, in the parking lot, even in the garage bathroom
If I recall correctly that is what the Beltway Snipers were doing, except they were peeing in jugs.