A Cautionary Note:
The Psychopathy Checklist is a complex clinical tool for professional use... Do not use these symptoms to diagnose yourself or others. A diagnosis requires explicit training and access to the formal scoring manual.
Also, be aware that people who are not psychopaths may have some of the symptoms described here. Many people are impulsive, or glib, or cold, or unfeeling, or antisocial, but this does not mean they are psychopaths.
From Without Conscience. The Disturbing World of the Psychopaths Among Us. by Robert D. Hare