Entering an Amazon Go store in Seattle by scanning a palm. (GeekWire Photo / Todd Bishop)

Amazon is expanding its new Amazon One palm-reading biometric identification system to three additional Amazon Go stores in Seattle.

The company debuted the technology in September. It works by scanning the palms of participating customers, giving them an alternative to the regular process of checking into the automated retail stores, which normally involves using a QR code in an app.

Amazon One is now available at the Amazon Go store at 1122 Madison St. and will launch at the 920 5th Ave. and 1906 Terry Ave. locations in the coming weeks. There will be eight Amazon physical retail stores in the Seattle area with Amazon One, including Amazon Books and 4-star locations.

Amazon envisions broad long-term adoption of the Amazon One technology for everything from in-store payments to accessing office buildings to entering sports stadiums. Amazon’s use of biometrics in stores and other commercial settings promises to attract scrutiny at a time of heightened awareness of digital security and privacy, testing the limits of customer trust in the company.

Like what you're reading? Subscribe to GeekWire's free newsletters to catch every headline

Job Listings on GeekWork

Find more jobs on GeekWork. Employers, post a job here.