A man believed to be Mexican drug lord Joaquin "El Chapo" Guzman, is pictured in what is believed to be the Altiplano prison in 2016, in this still image taken from a video supplied by news site Latinus on February 18, 2020. Clad in a beige uniform marked "3870," the captured drug kingpin answered the Mexican prison guard's questions calmly, barely looking up as he scrubbed black fingerprint ink from his hands. LATINUS/via REUTERS

A man believed to be Mexican drug lord Joaquin "El Chapo" Guzman, is pictured in what is believed to be the Altiplano prison in 2016, in this still image taken from a video supplied by news site Latinus on February 18, 2020. Alias? "El Chapo." Occupation? "Farmer." The interview is part of a four-year-old video released this week which appears to offer rare footage of notorious Mexican drug lord Joaquin Guzman, who is now under lock and key for life at a top-security U.S. prison. LATINUS/via REUTERS

A man believed to be Mexican drug lord Joaquin "El Chapo" Guzman, is pictured in what is believed to be the Altiplano prison in 2016, in this still image taken from a video supplied by news site Latinus on February 18, 2020. Obtained by news site Latinus, the seven-minute video and accompanying photos show Mexican law enforcement registering a man matching the appearance of Guzman at the Altiplano prison in 2016. LATINUS/via REUTERS

A man believed to be Mexican drug lord Joaquin "El Chapo" Guzman, is pictured in what is believed to be the Altiplano prison in 2016, in this still image taken from a video supplied by news site Latinus on February 18, 2020. The man in the images has the same haircut, features and build as Guzman on the day of his arrest, and his prison clothes and haircut match later images of the gangster behind bars. LATINUS/via REUTERS

A man believed to be Mexican drug lord Joaquin "El Chapo" Guzman, is pictured in what is believed to be the Altiplano prison in 2016, in this still image taken from a video supplied by news site Latinus on February 18, 2020. Guzman's arrest followed two earlier escapes - one via a mile-long tunnel from the same jail - that had humiliated the Mexican government. LATINUS/via REUTERS

A man believed to be Mexican drug lord Joaquin "El Chapo" Guzman, is pictured in what is believed to be the Altiplano prison in 2016, in this still image taken from a video supplied by news site Latinus on February 18, 2020. It was not immediately clear how Latinus obtained the video, or why it surfaced now. Mexico's security ministry did not respond to a request for comment on its authenticity, which Reuters was unable to independently confirm. LATINUS/via REUTERS