FedEx is using AI-powered cameras installed on its trucks to help aid police investigations, a new report has revealed.

The popular postal firm has partnered with a $4billion surveillance startup based in Georgia called Flock Safety, Forbes reported.

Flock specializes in automated license plate recognition and video surveillance, and already has a fleet of around 40,000 cameras spanning 4,000 cities across 40 states.

FedEx has teamed up with the company to monitor its facilities across the US, but under the deal it is also sharing its Flock surveillance feeds with law enforcement. And it is believed to be one of four multi-billion dollar private companies with this arrangement.

It's led critics to liken the move to rolling out a mass surveillance network - as it emerged that some local police forces are also sharing their Flock feeds with FedEx.

Jay Stanley, a policy analyst with the ACLU, told the Virginian Pilot: 'There's a simple principle that we've always had in this country, which is that the government doesn't get to watch everybody all the time just in case somebody commits a crime.'

'The United States is not China,' he continued. 'But these cameras are being deployed with such density that it's like GPS-tracking everyone.'

In response to Forbes' report that FedEx was part of Flock's surveillance system, he told the outlet: 'It raises questions about why a private company…would have privileged access to data that normally is only available to law enforcement.'

He went on to bill it as 'profoundly disconcerting'.

Flock Safety's cameras are used to track vehicles by their license plates, as well as the make, model, and color of their cars. Other identifying characteristics are also monitored, such as dents and even bumper stickers.

Lisa Femia, staff attorney at the Electronic Frontier Foundation, warned that FedEx's participation could prove problematic because private firms are not subject to the same transparency laws as cops.

This, she told Forbes, could '[leave] the public in the dark, while at the same time expanding a sort of mass surveillance network.'

The Shelby County Sheriff's Office in Tennessee confirmed its partnership with Flock in an email to Forbes.

'We share reads from our Flock license plate readers with FedEx in the same manner we share the data with other law enforcement agencies, locally, regionally, and nationally,' public information officer John Morris told the outlet.

He also confirmed his department had access to FedEx’s Flock feeds.

Its participation was unmasked after Forbes found the name of the force on publicly available lists of data sharing partners - along with others such as the Pittsboro Police Department in Indiana, located just outside of Indianapolis.

Pittsboro police chief Scott King reportedly did not comment on why his department is participating but insisted the force had not requested access to a private system.

'Only those listed under law enforcement,' he said.

Assistant Chief of Greenwood Police Department Matthew Fillenwarth confirmed its force, also in Indiana, is similarly participating.

Memphis police department also stated it had received camera feeds from FedEx but did not confirm if these were provided by Flock.

When speaking about networks of license plate readers, Brett Max Kaufman, a senior staff attorney at the American Civil Liberties Union (ACLU), told Forbes: 'The scale of this kind of surveillance is just incredibly massive.'

He went on to describe to the outlet how the warrantless monitoring of citizens en masse was 'quite horrifying'.

FedEx declined to answer questions about its partnership with Flock, saying in a statement: 'We take the safety of our team members very seriously. As such, we do not publicly discuss our security procedures.'

There is no suggestion the partnership is illegal, but some critics suggest it is flouting the basic tenets of the Constitution

For now, it is currently unclear just how far-reaching the partnership between law enforcement and FedEx actually is or how much Flock data is being shared.

Forbes also found that FedEx was not alone its decision to sign up - with Kaiser Permanente, the largest health insurance carrier in the US, also taking part.

The company shared data garnered from Flock cameras with the Northern California Regional Intelligence Center, an intelligence hub that provides support to local and federal police investigations involving major crimes across California's west coast.

'As part of our robust security programs, license plate readers are not only an effective visual deterrent, but the technology has allowed us to collaborate with law enforcement within the parameters of the law,' a spokesperson confirmed.

'The technology has been used in response to warrants and subpoenas, as well as in other scenarios regarding potential or ongoing crimes on the facilities' premises -and it has supported the arrest and prosecution of those committing crimes.'

The cameras were labeled to disclose to passersby they were filming - but she declined to comment when asked about where the company had these cameras deployed.

Meanwhile, police forces around the world over the past few years continue to pick up Flock as a partner - with more than 1,800 law enforcement agencies taking part.

Overall, more than 3,000 American communities use Flock technology, only ten years since the startup surfaced in 2014.

The firm today is valued at nearly $4billion, and continues to receive a steady stream of venture capital.

In 2022, it raised an astounding $300 million in just seven months, followed by $38 million in Series B funding February the following year.

It uses real-time data 'to enable and incentivize safer driving,' a description on its website states - describing the effort as 'the world's first fully digital insurance company for connected and autonomous commercial vehicles.'

'Eliminate crime in your community' a chyron geared toward businesses in the private sector - such as grocery stores - reads.