legal issues
...that due to backlash from the trial of John Hinckley, Jr., under US law an expert witness can no longer testify on legal issues such as the insanity defense?
...that due to <a class="mw-disambig" href="./Backlash" id="mw7A" rel="mw:WikiLink" title="Backlash">backlash</a> from the trial of <a class="mw-redirect" href="./John_Hinckley,_Jr." id="mw7Q" rel="mw:WikiLink" title="John Hinckley, Jr.">John Hinckley, Jr.</a>, under US law an <a href="./Expert_witness" id="mw7g" rel="mw:WikiLink" title="Expert witness">expert witness</a> can no longer <a href="./Testimony" id="mw7w" rel="mw:WikiLink" title="Testimony">testify</a> on <b id="mw8A"><a class="mw-redirect" href="./Ultimate_issue_(law)" id="mw8Q" rel="mw:WikiLink" title="Ultimate issue (law)">legal issues</a></b> such as the <a href="./Insanity_defense" id="mw8g" rel="mw:WikiLink" title="Insanity defense">insanity defense</a>?