Duvall rarely wrote opinions, but one memorable dissent was in the case ''Mima Queen and Child v. Hepburn''. An [[abolitionist|opponent of slavery]], Duvall disagreed with the majority's ruling that [[hearsay]] evidence should not be allowed in determining whether a slave is free.<ref name="oyez"/><ref>{{cite web|title=Gabriel Duvall - Maryland, Court, Admitted, Served, Freedom, and President|url=http://law.jrank.org/pages/6324/Duvall-Gabriel.html|language=English|work=law.jrank}}</ref> | Duvall rarely wrote opinions, but one memorable dissent was in the case ''Mima Queen and Child v. Hepburn''. An [[abolitionist|opponent of slavery]], Duvall disagreed with the majority's ruling that [[hearsay]] evidence should not be allowed in determining whether a slave is free.<ref name="oyez"/><ref>{{cite web|title=Gabriel Duvall - Maryland, Court, Admitted, Served, Freedom, and President|url=http://law.jrank.org/pages/6324/Duvall-Gabriel.html|language=English|work=law.jrank}}</ref> |