I use this with moderate success. I think my limited success is the nature of the creek constantly cycling out water.

In the US they can be bought as mosquito bits/dunks https://summitchemical.com/products/mosquito-bits/

It is important to note this is not a poison. It is a naturally occurring bacteria that is harmless to the food chain (Bacillus thuringiensis). That is important to me and, I think, a lot of others.

It’s not likely they would. The US did some fucked up stuff, but (in this case) didn’t try to hide it…

that would make someone a real bastard…