The spy expert is iffy, however, when it comes to the M:I self-destructing messages. "I don’t know that we’ve tried that," she said cagily – adding: "There are many ways to convey a message.

Former CIA chief of disguise Jonna Mendez says the iconic mask tech from "Mission: Impossible – The Final Reckoning" isn't just Hollywood fiction.

Former CIA chief of disguise Jonna Mendez says the iconic mask tech from "Mission: Impossible – The Final Reckoning" isn't just Hollywood fiction.

Former CIA chief of disguise Jonna Mendez says the iconic mask tech from "Mission: Impossible – The Final Reckoning" isn't just Hollywood fiction.

Former CIA chief of disguise Jonna Mendez says the iconic mask tech from "Mission: Impossible – The Final Reckoning" isn't just Hollywood fiction.