Atty. Jennifer Arlene Reyes’s lecture on Constitutional Law I provides a comprehensive discussion on recent Supreme Court decisions, constitutional principles, and key statutory updates in substantive and procedural law. She analyzes major jurisprudence, including the 2026 ruling in Sara Duterte v. House of Representatives concerning the one-year bar rule, constitutional procedures, and due process in impeachment proceedings. The lecture explores core concepts under the Legislative and Executive Departments, such as the doctrine of constitutional supremacy, the limits of legislative inquiry and contempt powers, the One Subject, One Title rule, the President's item veto power, presidential appointments requiring Commission on Appointments confirmation, the alter ego doctrine, and presidential immunity from suit. Additionally, Atty. Reyes highlights Bill of Rights protections and procedural developments under Constitutional Law II, focusing on the equal protection clause, rules on searches and warrantless arrests, custodial investigation rights, the chain of custody requirement under Republic Act No. 9165 as amended, and the Department of Justice guidelines on bail recommendations for indigent respondents. Overall, the lecture aims to deepen legal practitioners' understanding of evolving constitutional doctrines and ensure adherence to procedural and substantive standards in legal practice.