It is the controlling opinion when no majority opinion exists such as in the case of [[Planned Parenthood v. Casey]] <ref>http://www.prochoice.org/policy/get_informed_active/glossary.html#plurality</ref> | It is the controlling opinion when no majority opinion exists such as in the case of [[Planned Parenthood v. Casey]] <ref>http://www.prochoice.org/policy/get_informed_active/glossary.html#plurality</ref> |