Whole Foods stores in California will be the first in the country to use Amazon's "One" palm scanning technology. Stores in Malibu, Montana Avenue, Santa Monica, Los Angeles, Orange County, Sacramento, the San Francisco Bay Area and Santa Cruz are getting the tech that aims to modernize retail shopping.

When the checkout devices were first announced in 2020, Amazon One was only available in Amazon Go stores and will eventually be available in Whole Foods stores in Austin, Seattle, Los Angeles and New York City. At the Amazon Style store in California, customers can check out items with their hands.

It is part of the company's mission to use "contactless" technology that makes it quicker to pay. The tech works like this: Users visit a kiosk or a point-of-sale station to link their payment card to the service. All they need to do is hover their hand over a scanning device to complete the transaction.

Machine learning is being used to create palm signatures. While the kiosk takes a picture of a user's palm, the company doesn't store it there but instead sends it to a server for matching

Concerns about privacy have increased as Amazon customers continue to give up their data.

You already use fingerprints if you use Face ID or a similar device. It is possible that some users are against the idea of Amazon One being able to track your movements.

A group of U.S. senators voiced their concerns about the palm- scanning system. In contrast to Apple's Face ID and Touch ID, which store a user's fingerprints on their device, Amazon One does not, according to the senators.

Last year, Amazon acquired ticketing company AXS, with plans to implement Amazon One at Denver, Colorado's Red Rocks Amphitheater. Hundreds of music fans, artists and human rights groups demanded that Red Rocks stop using technology that uses palm scans and facial recognition. They signed a letter saying they were concerned about Amazon sharing palm print data with government agencies.

Amazon has been known to store voice data, so people aren't wrong to be concerned. Amazon sold facial recognition services to law enforcement in the United States.

The acquisition of iRobot may have led to more data collection methods.

Amazon expands its biometric-based Amazon One palm reader system to more retail stores