Lee's Television Protagonist Truthfulness Principle: Protagonists* in television shows are, almost without exception, incapable of uttering a falsehood in a convincing manner. When attempting to be untruthful, they will clearly betray their intentions through vocal inflection, altered speech patterns, hesitation, and physical "tells".
Corollary 1: All characters in television shows will be utterly incapable of detecting untruthfulness even when broadcast by vocal inflection, altered speech patterns, hesitation and physical "tells".
* And frequently antagonists, but not to such a universal degree.