Also, defense lawyers don’t like to hang their hats on nullification - they will almost never present a defense that basically concedes the defendant did the act but the law prohibiting said act is wrong. (I say almost because I presume someone somewhere has done it, although I’ve personally never seen or heard about it, and I’ve been a prosecutor for a decade) Defense lawyers will offer a defense of some kind, even if they don’t call witnesses of their own. (The defense will come out when cross-examining the state’s witnesses.) If the defendant is acquitted, the acquittal will appear as though the defense was given sufficient credibility to create reasonable doubt, and not as any blow against whatever law the defendant was charged with breaking.