In general, in the U.S. a judge can overturn a jury&#x27;s verdict only if the judge concludes:<p>(i) that <i>no</i> reasonable jury could have reached the verdict on the evidence of record -- if reasonable people could disagree, given the evidence of record,, then the verdict must stand; or<p>(ii) that the verdict was <i>(or was likely to have been -- I forget which it is) </i> the product of bias or prejudice; or<p>(iii) that (in hindsight) the judge screwed up in giving the jury its instructions about how to apply the law.<p>There are also some procedural prerequisites, e.g., for item (i) the losing party must have moved for &quot;judgment as a matter of law&quot; before the case was submitted to the jury, while for item (iii) the losing party must have objected to the flawed jury instructions before they were given to the jury.<p>For federal courts these requirements derive from the Seventh Amendment to the Constitution, which provides in part: &quot; ... no fact tried by a jury, shall be otherwise reexamined in any court of the United States <i>[which means federal courts]</i>, than according to the rules of the common law.&quot; [1]<p>[1] <a href="https:&#x2F;&#x2F;www.law.cornell.edu&#x2F;constitution&#x2F;seventh_amendment" rel="nofollow">https:&#x2F;&#x2F;www.law.cornell.edu&#x2F;constitution&#x2F;seventh_amendment</a>