> Legal tender has never been challenged in court to my knowledge
It was challenged and upheld, both as against debts before the the legal tender acts were passed and those after, by the Supreme Court in Knox v. Lee (1871).
(And because government can exempt itself from virtually anything not forbidden by the Constitution. This is why cops can break down your door, but I can't.)
It was challenged and upheld, both as against debts before the the legal tender acts were passed and those after, by the Supreme Court in Knox v. Lee (1871).