Authors Walker and Hemmens have included introductory and summary chapters to aid readers in understanding the context, importance, and applicability of the case law. All chapters have been updated to reflect U.S. Supreme Court decisions up to and including the 2021 term of court. Important cases added to this edition include: Caniglia v. Strom (2021) (warrantless search), Kansas v. Glover (2020) (vehicle stop), Mitchell v. Wisconsin (2019) (warrantless drawing of blood), Rivas-Villegas v. Cortesluna (qualified immunity), and Nieves v. Bartlett (2018) (retaliatory arrest). A helpful Appendix contains the Bill of Rights and the Fourteenth Amendment, and a Table of Cases lists every case referenced in the text.