It was always difficult to determine such things when dealing with Vulcans.
That, however, really served as little more than backup to his own innate ability to determine such things.
"It's getting them back a second time that determines things."
Whatever happened to them determining such things for themselves, or having enough knowledge of the subject matter to do so?
Yeah, the innocent people were nicely to one side, but bullets are determined little things, once you pull the trigger they will hit something.
These tests can determine different things about a person's personality.
The information helped determine such things as who got released, put on a regular diet or helped with finances.
But then at some point, the theory shows that we cannot determine certain things.
This could also be used to determine things such as what bank a person users in order to target an attack.
After all, why should the alphabet or record sales constantly determine things?