The unwritten or common law of any state or territory of the United States may be proved by parol evidence, and by the books of reports of cases adjudged in its courts.
Wis. Stat. § 889.05
The unwritten or common law of any state or territory of the United States may be proved by parol evidence, and by the books of reports of cases adjudged in its courts.
Wis. Stat. § 889.05