*David is referring to Dr. Robert Hare's psychopathy checklist which works like this:
For each characteristic listed, the subject is given a score: 0 for "no," 1 for "somewhat," and 2 for "definitely does apply." The end total is the score.
1. Glibness/superficial charm
2. Grandiose sense of self-worth
3. Need for stimulation/proneness to boredom
4. Pathological lying
5. Conning/manipulative
6. Lack of remorse or guilt
7. Shallow affect
8. Callous/lack of empathy
9. Parasitic lifestyle
10. Poor behavioural controls
11. Promiscuous sexual behaviour
12. Early behaviour problems
13. Lack of realistic, long-term plans
14. Impulsivity
15. Irresponsibility
16. Failure to accept responsibility for own actions
17. Many short-term relationships
18. Juvenile delinquency
19. Revocation of conditional release
20. Criminal versatility
21. Narcissism