This book did not teach me how to identify a psychopath, though it did give some warning signals. It had lots of tangents that were more about describing the lives of a few mentally ill individuals than the "madness industry" and psychopaths.

The position of the author is that all of us are a bit mad, and pharmaceutical companies exploit that for profit, though that opinion wasn't explored in depth or supported with journalistic investigation. Regardless of whether you agree with the author or not, I think it would be more respectable to have gone a little deeper there.