Research leading case law, check the authorities you find, and trace each argument back to primary legislation — across a curated commons of public legal sources.
How have courts interpreted action “under color of” state law?
Paste a citation as written. The resolver identifies its family, isolates the lookup core and routes it to the legal sources that can verify the underlying record.
Separate the authority, pinpoint and citation signal.
Reporter, neutral, statutory and international citation families.
Open the record and test the proposition against the source text.
Move from the legal question to the cases that interpret it, then back to the enacted text. The research trail remains visible, so a conclusion never floats free of its authority.
Search full-text case law and rank the decisions that courts cite most often.
Discovery · CourtListenerResolve the citation, open the full judgment and inspect the exact holding or passage.
Authority · CAP & official courtsFollow statutory references to the original legislation, regulations and amendment history.
Primary law · statutes & rulesResearch how courts interpret 42 U.S.C. § 1983. Read the leading cases and compare each holding with the original statutory text.Classify, route and verify citations across case law, legislation and international sources.
Verify & fact-checkFind leading US authorities by topic, ranked with citation-count importance signals.
15M+ citationsResolve reporter citations and read the underlying opinions in the Caselaw Access Project.
6.7M opinionsSearch primary text from the US Code, CFR, Federal Register, EUR-Lex and national sources.
Primary lawExpert-annotated clauses and deal points from CUAD, MAUD and LEDGAR.
Clauses & precedentsBuild and test products with SEC/EDGAR provisions, clause-risk, deal-point, bill-summary and case-holding corpora.
Investigating evidence: asbestos, J&J talc, opioids & EnronAdd practical context from the UK company register and official planning constraints.
Business & property contextDecisions and legislation across dozens of jurisdictions, with visible metadata coverage.
Global coverageInstall skills for citation checking, case law, statutes, contracts and world law. They teach an agent where to search, how to rank authorities and when to read the primary source.
Get the AI skillsExplore the public resources, test the citation resolver, or create an API key for research across the full OpenLegalData commons.