• Free Speech & Social Media
      • Privacy & Surveillance
      • Transparency & Democracy
    • Litigation
    • Research
    • Policy
      • Events
      • Reading Rooms
      • Blog
      • Video
      • Podcasts
      • The Knight Institute
      • Board
      • Staff
      • Visiting Scholars
      • Work With Us
      • Support Us
      • Contact
      • Press Room

Legal Filing

Defendant's Opening Brief

October 21, 2025

United States v. Belmonte Cardozo

A Fourth Circuit case addressing the constitutionality of warrantless cellphone searches at the border

Filed Under

  • Amicus Brief

Issues

Free Speech & Social Media

Free Speech & Social Media

Featured

Knight Institute Says Visa Revocations Over Charlie Kirk Criticism Are Unconstitutional

     

Privacy & Surveillance

Privacy & Surveillance

Featured

Appeals Court Revives Journalists’ Case Against Spyware Manufacturer NSO Group

Spyware manufacturers should be held accountable in U.S. courts for actions violating U.S. law, Knight Institute says

Transparency & Democracy

Transparency & Democracy

Featured

Knight Institute Seeks Immediate Release of Trump Administration Agreements with Major Law Firms

 Says records are key to public’s understanding of administration’s vindictive campaign against political opponents

Events

The Science of Chilling Effects

Online

The Science of Chilling Effects

Learn More

Sign up for news about First Amendment events, research, and litigation

  • Issues

    • Free Speech & Social Media
    • Privacy & Surveillance
    • Transparency & Democracy
  • Litigation
  • Research
  • Policy

  • Public Education

    • Events
    • Reading Rooms
    • Blog
    • Video
    • Podcasts
  • About
  • Press Room
  • Contact
  • Privacy Policy

© 2021 Knight First Amendment Institute. Design by Point Five. Development by Tierra Innovation. Icons by Leandro Castelao.

2020 Webby Award Winner for Law Website