Waukesha Sheriff’s Flock Cameras Raise Questions

The Waukesha County Sheriff Department. An audit of the department’s use of data from the Flock surveillance camera system shows inconsistent reporting the reasons on the reasons investigators access the information, a problem common among police agencies. (Photo by Isiah Holmes/Wisconsin Examiner)

Like other Wisconsin law enforcement agencies, the Waukesha County Sheriff’s Department (WCSD) uses Flock cameras for many reasons, though department personnel don’t always clearly document what those reasons are. Audit data reveals that staff most frequently entered “investigation” in order to access Flock’s network, while other documented uses are raising concerns among privacy advocates.

Flock cameras perpetually photograph and, using AI-powered license plate reader technology, identify vehicles traversing roadways. Flock’s system can be used to view a vehicle’s journey, even weeks after capturing an image, or flag specific vehicles for law enforcement which have been placed on “Be On The Lookout” (BOLO) lists.

As of March 2025, the company Flock Safety was valued at $7.5 billion, with over 5,000 law enforcement agencies using its cameras nationwide. At least 221 of those agencies are in Wisconsin, including the city of Waukesha’s police department as well as the county sheriff . The Wisconsin Examiner obtained Flock audit data from the Waukesha County Sheriff’s Department through open records requests, covering Flock searches from January 2024 to July 2025, and used computer programming to analyze the data.

Over that period of time, more than 6,700 Flock searches were conducted by WCSD using only “investigation”, as well as abbreviations or misspellings of the word. The searches, as they appeared in the audit data, offered no other context to suggest why specifically Flock’s network had been searched. Lt. Nicholas Wenzel, a sheriff’s department spokesperson, wrote in an email statement that “investigation” has a broad usage when Flock is involved.

“A deputy/detective using Flock for an investigation is using it for a wide range of public safety situations,” Wenzel explained. “Flock assists in locating missing persons during Amber or Silver Alert by identifying their vehicles and has proven effective in recovering stolen cars. Investigators use Flock to track suspect vehicles in serious crimes such as homicides, assaults, robberies, and shootings, as well as in property crimes like burglaries, catalytic converter thefts, and package thefts. The system also supports traffic-related investigations, including hit-and-run cases, and enables agencies to share information across jurisdictions to track offenders who travel between communities.”

Widespread use of vague search terms

Dave Maass, director of investigations at the Electronic Frontier Foundation, says that terms like “investigation” are too vague to determine whether or not Flock was used appropriately.  At least some responsibility falls on Flock Safety itself, Maass argues. “They’re setting up a system where it’s impossible for somebody to audit it,” he told the Wisconsin Examiner. “And I think that’s the big problem, is that there’s no baseline requirement that you have to have a case related to this…They say you have to have a law enforcement purpose. But if you just put the word ‘investigation’ there, how do you know? Like, how do you know that this is not somebody stalking their ex-partner? How do you know whether this is somebody looking up information about celebrities? How do you know whether it’s racist or not? And you just don’t, because nobody is checking any of these things.”

The audit also stored other vague search terms used by WCSD such as “f”, “cooch”, “freddy”, “ts”, “nathan”, and “hunt” which Lt. Wenzel would not define. “The search terms are associated with investigations, some of which remain active,” he wrote in an email statement. “To preserve the integrity of these ongoing investigations, no further description or clarification of the terms can be provided at this time.”

In August, Wisconsin Examiner published a similar Flock analysis that also found agencies statewide entering only the word “investigation,” with no other descriptor, in order to access Flock. At nearly 20,000 searches (not including misspellings and abbreviations), the term “investigation” was in fact the most often used term in that analysis, which relied on audit data obtained from the Wauwatosa Police Department.

While data from the Waukesha County Sheriff’s Department appeared in that first Flock story, that analysis focused on broad trends which appeared among at least 221 unique agencies using Flock in Wisconsin. This more recent analysis focuses specifically on the Waukesha County Sheriff Department’s use of the camera network.

The August report found that the Waukesha County Sheriff’s Department appeared among the top 10 Wisconsin law enforcement agencies that used Flock the most. The report also found that some agencies also only entered “.” — a period — in the Flock system field to indicate the reason for using the system. The West Allis Police Department led Wisconsin in this particular search term, followed by the Waukesha Police Department and the Columbia County Sheriff’s Office.

In response to an inquiry from the Wisconsin Examiner, a Waukesha Police Department spokesperson said that an officer who’d conducted nearly 400 Flock searches using only “.” as the reason had been provided extra training, and that the officer’s behavior had been corrected after the Wisconsin Examiner reached out. The West Allis Police Department, on the other hand, did not suggest that its officers were using the Flock network improperly.

Use of vague search terms is chronic across Flock’s network, Maass has found. He recalled one nationwide audit that covered 11.4 million Flock searches over a six-month period. Of those some 22,743 “just dots” appeared as reasons for Flock searches. Searches using only the word “investigation” made up about 14.5% of all searches, he said.

“So yeah, that’s a problem,” Maass told the Wisconsin Examiner. Reviewing a copy of Waukesha County Sheriff’s Department audit data, Maass saw the same vague search terms that have been reported by the Examiner. Although some terms can be reasonably guessed — such as “repo” perhaps meaning repossession, or ICAC, which usually stands for Internet Crimes Against Children — others aren’t so easy.

“‘Hunt’ can mean anything,” said Maass, referring to a term which appeared 24 times within the Waukesha Sheriff’s data. Maass points to the search term “f”, which the Wisconsin Examiner’s analysis found WCSD used to search Flock 806 times.

Maass highlights that each search touches hundreds or even thousands of individual Flock networks nationwide. “If I’m one of these agencies that gets hit by this system, how am I to know if this is a legitimate search or not?” Maass said. “Now, maybe somebody at Waukesha is going through their own system, and like questioning every officer about every case. Maybe they’re doing that. Probably not.”

Wenzel of the Waukesha County Sheriff’s Department said that although some searches appear vague, deputies and detectives are required by department policy to document their use of Flock in reports. Although a case number category does appear in the audit data, this column was rendered blank, making it impossible for Wisconsin Examiner to determine how often Flock searches had case numbers, or whether those case numbers corresponded with specific investigations the sheriff’s department had on file.

“The Sheriff’s Office understands the concerns surrounding emerging technology and takes very seriously its responsibility to protect the privacy and civil rights of the community,” Wenzel said in a statement. “The use of Flock license plate recognition technology is guided by clear safeguards to ensure it is only used for legitimate law enforcement purposes.”

The department’s policy, Wenzel explained, “prohibits any use outside of legitimate criminal investigations.” He said that deputies undergo initial and ongoing training to use the camera network. “All system activity is logged and subject to review,” said Wenzel.

Maass says the department can’t back-check the searches conducted by other agencies using the Waukesha Flock network, however. “Because when we’re talking about millions of searches coming through their system, you know, every few months…like hundreds of thousands at least every month…how are they actually quality controlling any of these?” Maass told the Wisconsin Examiner. “They’re just not.”

Wenzel said that “the technology is not used for general surveillance, traffic enforcement, or monitoring individuals not connected to an investigation.” The Wisconsin Examiner’s analysis, however, detected 43 searches logged as “surveillance” and 30 searches logged as “traffic offense.” The audit data also contained at least 357 searches logged as “suspicious” or variations of the word, as well as another 14 logged as “suspicious driving behavior,” 52 searches for “road rage” and 36 logged as “identify driver”.

There were also 62 searches related to evictions, which privacy advocates contend go beyond the public safety roles that the cameras were originally pitched to serve.

“Evictions can be unpredictable and potentially dangerous situations,” said Wenzel. “The removal of individuals from a residence often creates heightened emotions, uncertainty, and sometimes resistance. For this reason, safety is the top priority for both the residents being evicted and the deputies carrying out the court order. Flock is utilized to determine if the former tenants have left the area or could possibly be in the area when the court order is being carried out.”

Jon McCray Jones, policy analyst for the American Civil Liberties Union (ACLU) of Wisconsin, said in a statement that the Waukesha Sheriff’s use of Flock has extended “far beyond the public safety justifications for which these tools were originally sold.” McCray Jones told the Wisconsin Examiner, “These systems were introduced to the public as a means to reduce violent crime and aid in solving serious investigations. However, when they are used for non-criminal purposes, such as evictions, they cross a dangerous line.”

Waukesha’s uses for evictions were particularly concerning for McCray Jones. “What’s happening here is surveillance technology, operated by taxpayer-funded public servants, being weaponized at the behest of private landlords and corporations,” he said. “That is exactly the kind of mission creep communities are most worried about when it comes to police surveillance. If Flock cameras can be repurposed to target tenants today, what stops law enforcement tomorrow from using facial recognition to track people who fall behind on rent, or phone location data to monitor whether workers are ‘really sick’ when they call off? We’ve seen documented cases where law enforcement misused surveillance systems to track down romantic interests. Once the floodgate is opened, the slide into abuse is fast and quiet.”

Wenzel said that access to the Flock network is limited to personnel who are properly trained and authorized to use the software, and the department’s policy is regularly reviewed by those personnel.

“Searches are limited to legitimate law enforcement purposes per department policy,” he wrote in an email statement. The department has conducted its own Flock audits, Wenzel explained, and no sheriff department staff have ever been disciplined or re-trained due to Flock-related issues. Although the Waukesha County Sheriff’s Department is part of the federal 287(g) program, in which local law enforcement agencies participate in federal immigration enforcement, Wenzel said that Flock is not used as part of the program, and the Wisconsin Examiner didn’t find any clear examples of immigration-related uses by the sheriff’s department.

McCray Jones considers the Waukesha Sheriff’s use of Flock to be an example of why “surveillance technology in the hands of law enforcement must be tightly limited, narrowly defined, and rigorously transparent.” He stressed that every use “must be clearly logged and justified — not with vague categories like ‘investigation’ or ‘repo’, but with meaningful explanations the public can actually understand and evaluate. Without strict guardrails, audits like this reveal how quickly tools justified in the name of ‘safety’ turn into instruments of convenience or even private gain.”

With the growth of surveillance technologies and the civil liberties implications they raise, McCray Jones said that the public “deserves clear proof that it is being used only to reduce crime — particularly violent crime — and not to serve the interests of landlords or corporations. Accountability and transparency aren’t optional add-ons; they are the bare minimum to prevent abuse.”

Waukesha Sheriff Flock system data raises questions was originally published by the Wisconsin Examiner.