Definition of "doesn't"

Though Bane’s sing-song voice gives his pronouncements a funny lilt, he doesn’t have any of the Joker’s deranged wit, and Nolan isn’t interested in undercutting his seriousness for the sake of a breezier entertainment.

July 18 2012, Scott Tobias, AV Club The Dark Knight Rises

Santorum, in a comment regarding Senator John McCain's repudiation of torture, stated, "He doesn't understand how enhanced interrogation works. I mean, you break somebody, and after they've broken they become cooperative" (Summers 2011).

2015 November 30, Shane O'Mara, Why Torture Doesn’t Work: The Neuroscience of Interrogation‎, Harvard University Press, page 12