The TSA is demanding modifications of a new airport security system because it poses “privacy risks” to passengers by what is revealed on display, a newly published document has revealed.

Following a demonstration, the Transportation Security Administration has requested changes to the contract because the scanner they received “has privacy risks associated with the Graphical User Interface,” says the document dated March 26 and made public by Quartz on Monday.

While the document provides no further details on the exact nature of the privacy risks, the TSA required the scanner’s manufacturer to add additional security features before it would consider using the device in a “live environment.”

Using another government database, Quartz identified the contractor – whose name is redacted in the document – as Virginia security firm Thruvision. The document refers to Thruvision’s TAC scanner, which the company describes as a “proven people-screening camera that sees any type of item.”

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The device is supposed to be part of TSA’s “Future Lane Experience” (FLEx), an effort to speed up security checks that have become a major headache for passengers in many airports.

The Los Angeles County Metropolitan Transportation Authority partnered with the TSA last year to deploy Thruvision’s portable TS4 scanner, which the TSA claims to have vetted “extensively” prior to using it on LA commuters. It is unclear whether the TSA had similar concerns about the TS4 before the device was used in the field.

Following the report, Thruvision said that the modifications required by TSA are “privacy filters” that a 2013 federal regulation demands all people scanning filters to have. The company told RT that the images produced by their scanner do not show any anatomical details and look like a green ghost with sections colored black to indicate potential threats.

The scanner uses Terahertz submilimeter wave technology, similar to a thermal or infrared scan.

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“Thruvision provides fast, safe and respectful screening for all travelers including women, children, men, the elderly, mobility challenged, and transgender individuals,” Thruvision's VP for Americas Kevin Gramer said in a statement to RT. "Our aim is to reduce queues and remove the need for physical searches in US airports and we look forward to working with TSA to help achieve this.”

Revelations about the TSA concerns over the new scanner come after last week’s report by ProPublica that accused the agency’s current hardware of “discriminating” against African-Americans by misreading their hair, requiring a disproportionate number of pat-downs.

Airport body scanners were designed with racial bias and new data shows that the technology contributes to discriminatory searches against black women and people who wear head coveringshttps://t.co/SyTPbW5QKq — flesh-colored (@haitreason) April 23, 2019

Airport security scanners single out black women because of their hair: report https://t.co/0wpQTybsz2 — La Tonya Green (@drlatonyagreen) April 17, 2019

The ACLU slammed the TSA in 2009 for using scanning technology to conduct “virtual strip searches” that provided TSA employees with photos of passengers’ genitals, breasts and buttocks. More was revealed in 2010, when the Electronic Privacy Information Center (EPIC) published TSA documents which further detail the scanners’ invasiveness.

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