Though that is very true... I did alot of research on mushrooms and actually own a few books on mushroom hunting/cultivation so I've got a pretty good eye for them but still you can't always be sure.

One of the main factors on whether the mushrooms contain psilocybin or not is if they bruise blue after you touch them.. but I think their may be one other strain that does the same thing, but it's not poisinous.