[foxhop]

Always cook mushrooms, you can taste a little when out foraging to help identify but all mushrooms should be cooked (even lightly) before being consumed as food.

Magic mushrooms are consumed raw.

[cwkoss]

Even store-bought mushrooms should be cooked. There is some evidence that the common white button mushroom contains some carcinogens when raw.

https://grantome.com/grant/NIH/R01-CA031611-05

(Note: other studies have concluded the dosage is too low for concern, the jury is still out)

But also, many kinds of bacteria can thrive in mushroom growing conditions - good idea to sterilize before you eat.