All findings of fact in the American Judicial system are supposed to be findings of the Jury. The Jury finding can not be overturned.
What the Jury can not do is find someone guilty, but the law unconstitutional, so in that sense, the legal community is right, there is no juror annulment.
Jury Forman:
"The defendent is innocent, if he gives back the cows."
Judge:"This verdict is improper."
Jury Forman:
"The defendent is innocent, and he can keep the cows."
As the Irish jury found "The man who stole the horse is not guilty"