I mean, if you're selling chemicals, you should have a cursory awareness of the laws in the countries you ship to. And you should clearly mark what it is that is being shipped, so that if you miss something, it'll be flagged by customs.

But governments of the world have a DIS-incentive to actually stop illegal activity before the fact, they want illegal activity to happen so they can swoop in and score points with the public by showing off how many criminals they brought to justice.