It was a misunderstanding on her part, not a deliberate 'deception' on his (part). [=he didn't try to deceive her or lie to her]
The article describes the government's use of 'deception' [='deceit'] to gain public support for the program.
She 'practiced deception' on her unsuspecting clients. [=she deceived them]
(..) event of an attack... An attack from who? Y-You just said all our enemies are denying responsibility. Because all warfare is based on deception and there are still plenty we haven't heard from. I just don't feel comfortable showing that kind of force yet. With all due respect, sir, (..)2016 TvShow: Designated Survivor Title: Pilot Season: 1 Episode 1