Do federal court rulings (non-appeal) function as estoppel or persuasive authority for them to be cited as authorities in state court civil complaints when the question at stake relates to state laws?
1 Answers
That depends what the issue is. On constitutional issues, and on issues of federal law (which do come up in state cases) , they are binding precedent, at least in that circuit for an appeals court opinion, and in the whole US for a Supreme court opinion. District court opinions are not generally binding unless upheld on appeal. On matters of state law, the state's own highest court is the final word, but a federal opinion could be at least as persuasive as one from a different state.
to the best of my understanding one does not use the term "estoppel" to describe the effect of a previous judgement by a different court. If it is in the same case and not on appeal, the term is Res judicata ("A thing (already) judged"). If it is a general matter of adhering to clear precedent, the term Stare decisis (“to stand by things decided.” ) would be used.
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