A report by anti-fraud firm Pindrop states that error rates on voice biometrics may double in a two-year span, leading the company to reccomend that multifactor authentication be deployed alongside voice authentication systems.Representatives from Pindrop presented a report at the annual RSA Conference in San Francisco, notes an article by Dark Reading.Elie Khoury, principal research scientist at Pindrop, says the team studied former-President Barack Obama's speech patterns in his daily addresses from January 2009 to January 2017 and found that the former president's voice-accuracy rating dropped by 23%.The Pindrop team tracked 122 speakers in six languages (English, French, German, Spanish, Dutch, and Italian) and error rates doubled from 4%- to 8% in two years. One interesting note: The female voice does not change as much as the male voice, and voices of men aged 60 and over change the most dramatically.”Too many companies will just deploy voice biometrics, and that's a mistake,” says Terry Nelms, director of research. “There's a real need for multifactor authentication, with voice biometrics just being a piece of the puzzle.”Khoury said the research found that 48% of callers only call in to the average banking call-center system once every eight months, and the human voice can change over that time. Pindrop cited the importance of compensation techniques it uses that take into account the caller's gender, age, and the time interval between the last call and the next call. However, Pindrop also recommends applying a multifactor authentication technique such as phoneprinting to prevent identity theft.