HR-4811-119
Referred to the Committee on the Judiciary, and in addition to the Committees on Intelligence (Permanent Select), Armed Services, and Energy and Commerce, for a period to be subsequently determined by the Speaker, in each case for consideration of such provisions as fall within the jurisdiction of the committee concerned.
Sponsored by Ted Lieu (D-CA)
What it does
This bill would make it unlawful for any person or government entity to use a cell-site simulator — a device that mimics a cell tower to identify, locate, or intercept transmissions from nearby phones — without a court-issued warrant. Law enforcement agencies would be required to demonstrate to a judge that other investigative methods have failed or are impractical, specify the narrowest possible area and duration of use, and disclose potential disruptions to emergency calls and other communications. The bill would also allow emergency warrantless use in limited circumstances (imminent danger, kidnapping, mass casualty events), require minimization and destruction of data collected on non-targeted bystanders, create a civil lawsuit right for victims of unlawful use, and mandate annual Inspector General reports to Congress on compliance and usage statistics.
Who benefits
All U.S. residents whose cell phones could be swept up in a cell-site simulator operation — including bystanders near a surveillance target. Criminal defendants who would gain the right to disclosure of any cell-site simulator evidence used against them. Civil liberties and privacy advocates. Journalists, activists, and protesters whose phones may be present at public gatherings. People with disabilities who rely on telecommunications relay services that could be disrupted. Researchers and academics who receive an explicit carve-out to use the devices for legitimate study. Telecommunications companies and the FCC, which gain clearer regulatory authority over the devices.
Who is hurt
Federal, state, and local law enforcement agencies that currently use cell-site simulators with fewer procedural requirements, who would face new warrant obligations, data destruction mandates, and civil liability exposure. Intelligence community agencies subject to new FISA-based restrictions. Correctional facilities using contraband interdiction systems, which would face new testing, signage, and reporting requirements. Prosecutors who could lose evidence obtained without a warrant under the bill's exclusionary rule. Taxpayers and government budgets that would bear the cost of compliance, third-party device testing, and Inspector General reporting infrastructure.
Supporters argue
Supporters argue that cell-site simulators are among the most invasive surveillance tools available to law enforcement — they indiscriminately sweep up data from every phone in an area, not just the target's, and can disrupt 911 calls and other emergency communications. They contend that the Supreme Court's ruling in Carpenter v. United States (2018) established that comprehensive digital location tracking requires a warrant, and that this bill simply codifies that constitutional baseline into statute while adding meaningful safeguards for bystanders. They further note the bill has bipartisan sponsorship, reflecting broad agreement that warrantless use of these devices is inconsistent with Fourth Amendment principles.
Opponents argue
Opponents argue that the bill's procedural requirements — including the "necessity" showing that other methods have failed, mandatory third-party device testing, and strict 30-day warrant windows — would significantly slow time-sensitive investigations and create operational burdens that impede law enforcement's ability to locate kidnapping victims, track terrorists, or respond to active threats. They contend that existing Justice Department policies and Carpenter already provide meaningful constraints, and that layering statutory civil liability and exclusionary rules on top of those protections could cause courts to suppress evidence in serious criminal cases on technical grounds unrelated to actual privacy harm.
Constitutional context
The Fourth Amendment's warrant requirement is directly at issue. In Carpenter v. United States (2018), the Supreme Court held that accessing comprehensive digital location records requires a warrant, signaling that new surveillance technologies may demand heightened constitutional protection even when third-party data is involved. This bill codifies and extends that logic to cell-site simulators, which not only collect location data but can intercept communications — implicating both the Fourth Amendment and the Sixth Amendment right to disclosure of evidence used against a defendant.
Checks and balances
The judicial branch gains authority by requiring court-issued warrants before executive-branch law enforcement may deploy these devices; Inspector Generals and Congress provide oversight through mandatory annual reporting, and individuals gain a private right of action in federal court against unlawful government use.
Historical precedent
The Electronic Communications Privacy Act of 1986 (ECPA) established the foundational federal framework for government access to electronic communications, and the USA PATRIOT Act and subsequent FISA amendments have periodically updated surveillance authority — but no prior federal statute has specifically regulated cell-site simulator use with a warrant requirement.