George Joseph and Debbie Nathan:

So when it was his turn, he walked up to the phone, picked up the receiver, and followed a series of automated instructions. “It said, ‘Say this phrase, blah, blah, blah,’ and if you didn’t say it clearly, they would say, ‘Say this phrase again,’ like ‘cat’ or ‘I’m a citizen of the United States of America.’” Dukes said he repeated such phrases for a minute or two. The voice then told him the process was complete.

“Here’s another part of myself that I had to give away again in this prison system,” he remembers thinking as he walked back to the cell.

Dukes, who was released in October, says he was never told about what that procedure was meant to do. But contracting documents for New York’s new prison phone system, obtained by The Appeal in partnership with The Intercept, and follow-up interviews with prison authorities, indicate that Dukes was right to be suspicious: His audio sample was being “enrolled” into a new voice surveillance system.

In New York and other states across the country, authorities are acquiring technology to extract and digitize the voices of incarcerated people into unique biometric signatures, known as voice prints. Prison authorities have quietly enrolled hundreds of thousands of incarcerated people’s voice prints into large-scale biometric databases. Computer algorithms then draw on these databases to identify the voices taking part in a call and to search for other calls in which the voices of interest are detected. Some programs, like New York’s, even analyze the voices of call recipients outside prisons to track which outsiders speak to multiple prisoners regularly.