This summary is not the rule. The rule text controls.
When a civil case involves a claim or defense that comes from federal law, federal law also decides how any presumptions in that case work. A presumption is a rule that lets a court assume something is true unless someone proves otherwise. For example, if a federal statute creates a legal claim and that statute comes with a built-in presumption, federal law controls how that presumption gets used in the case, not Idaho law.
This matters because state and federal courts do not always treat presumptions the same way. Some presumptions just help decide who has to present evidence first. Others actually shift the final burden of proof. Idaho's rule says that whenever the underlying claim or defense is based on federal law, you look to federal law to figure out which type of presumption applies and how strong it is.
In practice, this keeps things consistent. If someone brings a federal claim in an Idaho court, they get the same treatment on presumptions that they would get in federal court. This prevents the outcome of a federal claim from changing just because it happens to be heard in an Idaho courtroom instead of a federal one.
