The supreme court, of missouri, decides state v. Lane:

       There is a concept known as jury nullification–a jury deciding cases in disregard of a law they consider unfair, etc.  That is, however, simply a power a jury has because once the verdict is entered it cannot be impeached and the defendant retried.  Of course, the common experiences in life of the jurors properly form the background against which people—jurors—view the evidence in a case.  Jurors do not come to a courtroom bereft of the experiences of life and are expected to use them as jurors.

       [added 11/27/2022] Thanks to Jim Lorenz for this entry.