Mods - please feel free to move to .leo forum if more appropriate.
I've been wondering lately, in view of (specifically) riots being declared especially in say Portland OR, why LEO are not employing the tactics of using high pressure water in responses? Watching the over night feed of videos in the area around the Justice Center, in particular, the mob seems to be lighting fires, setting off professional-grade fire works, as well as direct projectiles either thrown or propelled (e.g. frozen water bottles, wrist rockets shooting marbles or shrapnel).
Please note: I am in no way objecting to people's right to protest and peaceably assemble under the First Amendment.
I'm talking about once it goes beyond that, in terms of a riot being declared in a specific area, with a mob armed specifically with flammable weaponized objects, it would seem getting everybody there a bit wet, might both dampen their ardour, as well as literally extinguish their ability to launch fireworks. In terms of US Law Enforcement, I don't recall water cannon being used in recent memory. Is it because of the optics in terms of previous use during the Civil Rights marches in e.g. Selma AL?
Are there any specific legal constraints in terms of the law, or previous practice guidelines, preventing this tactic from being used?
Are "water cannons" even available if the local command authority opts to use them? Are Fire Trucks an option? (seems like the obvious answer, but that of course removes a critical life saving asset from the local area in the event they are needed.)
Are there any specifics in terms of pressure for the stream of water being used?
Where are water cannons in the spectrum of applying force, in terms of riot control? More or less dangerous than using a baton?
Too much fallout in terms of collateral damage to innocent bystanders who might be in the area?
Thoughts?