Morels are not a poisonous mushroom........Sorry I didn't clarify that.
Morels contain small amounts of hydrazine toxins that are removed by thorough cooking; morel mushrooms should never be eaten raw.
It has been reported that even cooked morels can sometimes cause mild intoxication symptoms when consumed with alcohol.
When eating this mushroom for the first time it is wise to consume a small amount to minimize any allergic reaction. Morels for consumption must be clean and free of decay.
Morels growing in old apple orchards that had been treated with the insecticide lead arsenate may accumulate levels of toxic lead and arsenic that are unhealthy for human consumption.