[laegooose]

Nitpick: a healthy young person has ballpark 1 in 10 thousand chance of dying per year. So it's enough to be 99.9999% sure because extra nines don't really make your life safer.

[loki49152]

I'm personally willing to throw a couple of 9's on that figure to avoid dying the mushroom death.

[Matticus_Rex]

This is one reason I generally advise beginners to learn the few deadly mushroom species alongside any edible ones they're learning, and why some edible mushrooms are considered to be for more advanced foragers because of the possibility of confusion for beginners. But there are many species of edible mushrooms with zero toxic (much less deadly) lookalikes, which is where people generally start.