Texas Cops’ Secretive Phone-Tracking Tool Raises Big Costs, Bigger Civil Liberties Fears

Texas police and federal agencies are investing millions in Tangles, a geofencing tool that tracks historical phone locations via commercial ad data without warrants. Officials tout safety benefits but provide virtually no concrete case results, while defense attorneys and public records reveal little to no transparency. Civil liberties groups warn this is an end-run around Carpenter and due process, leaving the public to question whether the tool is ineffective or secretly used to bypass judicial oversight.

Key Points

• Tangles/WebLoc allows warrantless historical device tracking via commercial ad-tech data, raising Carpenter-era Fourth Amendment concerns.
• Texas agencies, especially DPS, have spent millions on Tangles while offering few or no verifiable examples of case outcomes or arrests tied to the tool.
• Public records are sparse or withheld; defense attorneys report no disclosures mentioning Tangles, fueling transparency and due process worries.
• PenLink claims legality and public-safety benefits, but critics say buying data circumvents judicial oversight and enables mass surveillance.
• Real-world use appears limited and opaque; even some users caution against abuse, and validated success stories remain elusive.

Sentiment

Overwhelmingly negative toward the surveillance tool and police secrecy. The community broadly agrees with the article that warrantless phone tracking via commercial data represents a serious civil liberties violation. Even commenters who see some legitimate use for law enforcement surveillance tools express alarm at the complete lack of transparency and judicial oversight. The few dissenting voices are significantly outnumbered.

In Agreement

• Using surveillance to 'find avenues for probable cause' is textbook parallel construction — an unconstitutional practice that should alarm everyone
• Purchasing commercially sourced mobile ad data is a deliberate end-run around the Supreme Court's Carpenter ruling requiring warrants for location data
• Police face virtually no consequences for breaking the law, as evidenced by the tiny number of convictions relative to the size of the force
• The data broker ecosystem makes privacy choices illusory — cookie consent banners and app permissions funnel data to brokers who sell it to law enforcement regardless
• The fact that agencies refuse to provide case examples or mention Tangles in discovery suggests the tool is either ineffective or being deliberately hidden from judicial review
• Surveillance technology developed by former Israeli military intelligence members follows a disturbing pattern seen with other invasive tools like Pegasus

Opposed

• Secrecy about investigative tools is important for slowing down bad actors — similar to how Google doesn't reveal fraud detection methods
• Users willingly share location data with apps, making this fundamentally different from a constitutional violation — the real complaint should be directed at data brokers
• The article's sensationalist framing could exacerbate paranoia in people with mental illness
• January 6 investigations that used phone data were standard warranted practices, not novel surveillance, and it's rational to approve of legal use while opposing illegal use