"Morels are more likely to cause intestinal distress if eaten raw, although even raw, they can be tolerated by some people," the agency wrote. Morels should be cooked before eating, as cooking can destroy bacterial contaminants. "For that matter, all mushrooms, wild or cultivated, should be cooked to release their full nutritional value because chitin in their cell walls otherwise inhibits digestion," the USDA writes.
The article mentions multiple times that cooked mushrooms are safer than raw ones.