It'd be cool if there were mushroom-testing reagent kits, like for MDMA etc. Edit: apparently chemical tests exist https://en.wikipedia.org/wiki/Chemical_tests_in_mushroom_ide...
It's not needed, it only takes an hour or so to teach a beginner the major genuses that contain poisonous species. In fact for the first year the rule is basically that if it looks like a mushroom then don't eat it.
Sure, that prevents people from dying. But what about all those mushrooms that people didn't dare pick? Is that not a loss - a loss that could be remedied by such a kit?