A lot I didn't quite agree with in that video. Also psychopaths are very hard to spot (at least the smart socialized variant are).
Anyhow here is something you may find interesting. The PCL-R
http://en.wikipedia.org/wiki/Hare_Psychopathy_Checklist
The basic checkist is below and score given as 0,1,2 per item, and if memory serves you need roughly a 24 or better. Keep in mind though this was designed for detecting non socialized (criminalistic) psychopaths, the only population available for study.
1 Glibness/superficial charm
2 Grandiose sense of self-worth
3 Need for stimulation/proneness to boredom
4 Pathological lying
5 Cunning/manipulative
6 Lack of remorse or guilt
7 Shallow affect [i.e. superficial experience and expression of emotions]
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 goals
14 Impulsivity
15 Irresponsibility
16 Failure to accept responsibility for own actions
17 Many short term marital relationships
18 Juvenile delinquency
19 Revocation of conditional release
20 Criminal versatility