It is true that some research supports the claim that individuals with an antisocial personality disorder may not exhibit the same increase in stress hormone levels when under stress as those without the disorder.
Psychologists have a more formal name for this type of disorder. They call it sociopathy. The patient who suffers from an antisocial personality disorder has no regard for what is wrong or what is right, and have no consideration for what other people think. They have no remorse for their actions.