This is an free online version of the Levenson Self-Report Psychopathy Scale, a test of sociopathy.
Psychopathy is a personality disorder characterized by a lack of empathy for others. The LSRPS was developed in 1995 for research related to psychopathy, it measures two scales of the trait.
The test conists of twenty six statements that could possibly apply to you. You must rate each on how much you agree with it on a scale of (1) strongly disagree (2) disagree (3) niether agree nor disagree (4) agree (5) strongly agree.
This test is NOT a diagnostic tool, it is offered only for educational purposes. Any important decisions related to this test should not be made without consulting a medical professional.
Other personality tests
Levenson, M.; Kiehl, K.; Fitzpatrick, C. (1995). "Assessing psychopathic attributes in a noninstitutionalized population". Journal of Personality and Social Psychology, 68, 151-158.