--- title: Cops Used Flock to Track a Man Across State Lines for a... description: Wisconsin police used Flock's license plate reader network to track a man's cross-state travel to Michigan — where marijuana is legal — and used that travel... canonical: https://daily.dev/posts/cops-used-flock-to-track-a-man-across-state-lines-for-a-pretextual-weed-search-bgmlozd3k twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Cops Used Flock to Track a Man Across State Lines for a Pretextual Weed Search | daily.dev og:description: Wisconsin police used Flock's license plate reader network to track a man's cross-state travel to Michigan — where marijuana is legal — and used that travel... og:url: https://daily.dev/posts/cops-used-flock-to-track-a-man-across-state-lines-for-a-pretextual-weed-search-bgmlozd3k og:image: https://api.daily.dev/og/posts/bGmLOZD3k.png og:image:alt: Cops Used Flock to Track a Man Across State Lines for a Pretextual Weed Search og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Cops Used Flock to Track a Man Across State Lines for a Pretextual Weed Search **[Hacker News](https://daily.dev/sources/hn)** · 5 min read · 0 upvotes · 0 comments ## Summary Wisconsin police used Flock's license plate reader network to track a man's cross-state travel to Michigan — where marijuana is legal — and used that travel history as probable cause to search his car for weed back in Wisconsin. The case illustrates how Flock's nationwide camera network enables police to build pretextual justifications for searches based on where someone's vehicle has traveled. The story also highlights a Michigan cannabis dispensary that was required by city ordinance to install a Flock camera at its entrance and give police live access, then was threatened with sanctions when it tried to block the camera's view. Critics warn this creates a slippery slope where surveillance tech used in unsympathetic cases normalizes broader use against minor crimes or legally protected activities like obtaining abortions across state lines. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community take How the wider developer community reacted, aggregated from 1 discussion and 111 comments across hackernews (as of 2026-08-05). **TL;DR:** Commenters are broadly alarmed by Flock's license plate reader network being used to build pretextual probable cause from legal interstate travel, seeing it as a dangerous expansion of surveillance infrastructure with little accountability; a minority debate the legal mechanics or defend enforcement technology in general. **Sentiment:** 5% positive · 15% mixed · 80% skeptical **The case for** - Some commenters note the technology did help locate a person with an active felony warrant who had evaded prior arrest attempts. - A few point out that existing legal safeguards like jury nullification and self-defense case law still exist as partial checks on police overreach. **The pushback** - Using legal interstate travel as probable cause for a drug search sets a chilling precedent that could be applied to abortion travel or any other legal-in-one-state activity. - Flock's cross-agency data sharing means federal agencies like ICE and DHS can access the network indirectly through local law enforcement partners, bypassing restrictions. - False positives from license plate misreads have already led to wrongful stops and traumatic encounters with innocent people, including families with children. - The surveillance infrastructure, once built for one purpose, consistently migrates to minor or pretextual enforcement rather than serious violent crime. - Municipalities requiring private businesses (like cannabis dispensaries) to install Flock cameras and grant live police access creates coercive surveillance by proxy. - The 'odor of marijuana' pretext combined with travel history creates a nearly unfalsifiable justification for searches that courts have generally upheld. **By community** - hackernews (skeptical): Overwhelmingly critical of Flock's use as a pretext-generation tool, with deep concern about the slippery slope to tracking abortion travel, racial disparities in enforcement, and the erosion of Fourth Amendment protections. **Hottest debate:** Whether the police action was genuinely pretextual given the subject already had an active felony warrant, or whether the interstate travel data was used specifically to pile on additional charges beyond what the warrant justified. **Open questions** - What legal standard should govern using legal interstate travel as probable cause, and will courts uphold or reject it? - How can individuals or businesses practically resist being enrolled in Flock's network when city ordinances mandate camera installation? - Will states with stronger privacy protections (like Oregon's appeals court ruling) create meaningful safe harbors, or will cross-state data sharing nullify them? - At what point, if any, does Flock's CEO's stated preference for false positives over false negatives become legally actionable? **Highlights** > This is the big problem with mass surveillance as a whole. With enough time, they'll find some pretext to bring you in, even if the original crime they want you for is weak. This will ruin lives, even if they're eventually let go. Jobs lost, evicted from homes, cars towed, pets surrendered and put down. Lives will be completely derailed, police and judges will not be held accountable. The wrongful arrestees will still be in debt to the local jail and court for various fees they racked up. Trust in the justice system will continue to degrade and more and more violence will be used against people to maintain order. We hold police to high standards for search/arrest because they have the monopoly on violence. Even if they're wrong, you can't shoot back. Even if they're slamming your loved ones into the pavement, breaking their teeth, you cannot kick the cop in the head or else they have permission to murder you both. Mass surveillance is a loophole to this contract. > — [MSFT\_Edging on hackernews · 9 comments](https://news.ycombinator.com/item?id=49184701) > worse than that, federal agencies - which can't access it directly - do so via their "law enforcement partners". So now you've got DHS and ICE using it for their own pseudo-law activities. > — [skeeter2020 on hackernews](https://news.ycombinator.com/item?id=49185422) > Woman with SUV filled with minors pulled out by cops and handcuffed on the ground in Colorado based on flock ID'ing the license plate of stolen... motorcycle with same number (but from a different state). You can't make this shit up. https://www.kxlf.com/news/america-in-crisis/aurora-police-de... > — [skeeter2020 on hackernews](https://news.ycombinator.com/item?id=49185398) > Necessary reading: "Ham Sandwich Nation: Due Process When Everything is a Crime" https://ir.law.utk.edu/utklaw_facpubs/468/ > — [MengerSponge on hackernews](https://news.ycombinator.com/item?id=49185465) > The two hang together. You campaign in your state to legalize something. Some other state, where you have very little influence, goes the other way. It isn't just cannabis. what if the law categorizes abortion as felony/murder? what if the law categorized certain types of sexual behavior as felony? > — [forlorn\_mammoth on hackernews](https://news.ycombinator.com/item?id=49185203) **Source threads** - [hackernews](https://news.ycombinator.com/item?id=49184190) · 197 points · 111 comments ## Similar posts on daily.dev - [Flock surveillance cameras are spreading across the US](https://daily.dev/posts/flock-surveillance-cameras-are-spreading-across-the-us-9dx0pt2ac) · The Next Web · 0 upvotes · 0 comments - [Flock Cameras and the New Era of Vehicle Surveillance — Joseph Sides](https://daily.dev/posts/flock-cameras-and-the-new-era-of-vehicle-surveillance-joseph-sides-v7fqfo90r) · Medium · 0 upvotes · 0 comments - [When Flock Comes to Town: Why Cities Are Axing the Controversial Surveillance Technology](https://daily.dev/posts/when-flock-comes-to-town-why-cities-are-axing-the-controversial-surveillance-technology-ddbqrvjjr) · Hacker News · 0 upvotes · 0 comments --- Tags: [#privacy](https://daily.dev/tags/privacy) [View this post on daily.dev](https://daily.dev/posts/cops-used-flock-to-track-a-man-across-state-lines-for-a-pretextual-weed-search-bgmlozd3k) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Cops Used Flock to Track a Man Across State Lines for a Pretextual Weed Search","url":"https://daily.dev/posts/cops-used-flock-to-track-a-man-across-state-lines-for-a-pretextual-weed-search-bgmlozd3k","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/cops-used-flock-to-track-a-man-across-state-lines-for-a-pretextual-weed-search-bgmlozd3k"},"datePublished":"2026-08-05T16:09:02.970Z","dateModified":"2026-08-05T17:11:18.410Z","description":"Wisconsin police used Flock's license plate reader network to track a man's cross-state travel to Michigan — where marijuana is legal — and used that travel...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/a6f738e9ae6a688d19575ca61490e066?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/a6f738e9ae6a688d19575ca61490e066?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Hacker News","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Hacker News","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/hn","url":"https://daily.dev/sources/hn"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/cops-used-flock-to-track-a-man-across-state-lines-for-a-pretextual-weed-search-bgmlozd3k","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"privacy","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Hacker News","item":"https://daily.dev/sources/hn"},{"@type":"ListItem","position":3,"name":"Cops Used Flock to Track a Man Across State Lines for a Pretextual Weed Search"}]} ```