On a 3 day backpacking in Wyoming trip I once ate a fist-full of Rubus phoenicolasius, thinking they were wild raspberries before I looked at the leaves and realized.... "those are not raspberries". Turns out they're fine...as anecdotal evidence shows... but now I'll generally conduct a thorough examination of the whole plant before eating anything; especially if I'm in a region in which I didn't grow up. When I'm home, I still eat all kinds of wild berries without really checking that thoroughly (strawberries, blueberries, cranberries -- both types, etc..).