Past court cases become open for public review online.  The ruling of a past similar case can be utilized as evidence within a court of law to share how a judge previously ruled on a similar matter.  The collection of past verdicts are referred to as case law, common law or judge-made law.  Case law shows past actions of judges in addition to written law.  The ruling for a greatly similar recorded past court case can encourage a future judge to rule on a future case likewise.  

Each case explains the reasoning for being brought before a judge, the arguments made, presented evidence and ruling of the judge.  Each case sets a precedence for argumentation and how a judge interpreted laws and evidence before applying the law to a real-world scenario to form a verdict.  As so, case law may establish that a past relatable case was ruled upon as sought in an upcoming case.

Rulings of Federal cases can be utilized within all states of the republic due to Federal preemption.  Results of cases from all courthouses in the state where the case is being heard can also be used as case law.  Cases from Municipal, Circuit, Court of Appeals and Supreme Court can be found online after becoming open for public review.  State-level case law generally does not apply in other states. 

History Section of Wisconsin Statutes  – Case Law
Look for the “History:” section toward the bottom of Wisconsin statutes.  It may contain applicable case laws established by judges in the past.

Search online for case law at Justia U.S. Law or search for specific types of past cases using a search engine.