Perhaps a helpful anecdote, there are ways to figure out if they are poisonous or not in a survival situation, but I won't go into it because it's generally a pretty stupid idea to waste your time unless you're chained to a goddamn tree and all you have is a bunch of mushrooms in reach. You can find information about it in survival books and maybe online. Even the most poisonous of them won't hurt you unless you ingest them or rub them on your tongue or gums like a coke head, so identification handling for examination and spore printing is completely safe.