That academics who do not want to succeed in doing something tend to be grossly unsuccessful in doing something is weak evidence that it cannot be done.
Some business places have a lot of small high value stuff, easily stolen, and a lot of employees with unmonitored access to that stuff.
Somehow they succeed in selecting (as close to 100% as makes no difference) employees who do not steal.
The evidence that people cannot detect lying resembles the evidence that the scientific method is undefined and impossible.
The existence and practice of certain business places shows that some people are very good at predicting other people's behavior, even when those people would prefer that they fail to predict that behavior.
That academics who do not want to succeed in doing something tend to be grossly unsuccessful in doing something is weak evidence that it cannot be done.
These academics would be richly rewarded, in and out of academia, for finding human lie detectors and even more so for finding techniques to train people into such things. This is true for all the obvious reasons, and for the more subtle reason that saying '99.75% of people suck and the ones who don't think this are self-deluded' is a negative result and academia punishes negative results.
(Also, bizarre ...
Recently I summarized Joshua Greene's attempt to 'explain away' deontological ethics by revealing the cognitive algorithms that generate deontological judgments and showing that the causes of our deontological judgments are inconsistent with normative principles we would endorse.
Mark Alfano has recently done the same thing with virtue ethics (which generally requires a fairly robust theory of character trait possession) in his March 2011 article on the topic:
An overview of the 'situationist' attack on character trait possession can be found in Doris' book Lack of Character.