The CEO made a public statement.  Any number of his employees or security experts could call him out if he were lying.  You think all computer security experts are in cahoots on this?<p>Cook could have lied and said building a special OS was impossible.  But he didn&#x27;t because he knows someone will find out.  When you&#x27;re facing a subpoena, you don&#x27;t knowingly lie.