Actually, it's not legal any place on the planet, for the use in MO collections that is. Most "foreign countries" have stiff laws on the books, it's the lack of enforcement that is not the same as here, well ours is lacking as well. Cyanide has been illegal in PI for many o years, yet it's still used rapantly there. It's mainly being used in Indo region and PI. Most countries are clean of that plague, like Fiji, Tonga, Soloman Islands, Christmas Island, Australia, USA, Mexico (to name a few).
Mihai, cyaniders found out a few decades ago that cyanide is a poor tool for collecting mandarins. Almost all mandarins are captured using a little hyperdermic needle spear pole thru the dorsal and held in the sand until the diver can snatch it up. They heal incredably quickly. The problem with them, is starvation prior to you getting them. A few weeks of not eating usually is a recipe for a prolonged death by starvation even if food is consumed later in that state. Most fish I see in that state have a poor chance at best of recovery. A very common sight indeed unfortunatly.