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Do you think Amanda Knox was lying?

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8.5 million viewers tuned in to watch Diane Sawyer’s interview with Amanda Knox. Knox was accused of murdering her roommate, Meredith Kercher in Umbria, Italy in 2007. She spent 1400 days in jail before her case was overturned.

Her case and behavior have been shrouded in mystery. Followers of the trial have wondered:

Did she really kill Meredith Kercher?

Is she hiding information about the murder?

Does she know more than she is willing to reveal?

Her interview with Diane Sawyer brought to light some new issues and her body language and nonverbal cues might have given us more information than what she actually said.

YouTube video

Since I was only able to watch Knox’s interview and was not able to baseline her, below I will point out a few of the red flags from the interview where I believe Sawyer could have dug a little deeper as her body language did not match her verbal answers.

Here are a few interesting body language clues from Knox’s interview with Diane Sawyer:

1. MATCH: Slow Blink Rate

Throughout the interview Amanda Knox had a noticeably slow blink rate, which is a good sign that she was not lying. Deception and high nerves can both cause a faster blink rate, so her slow blink rate was a good sign that her body language matched her statement of innocence.

2. MATCH: Contempt

Amanda Knox Contempt

Another positive sign that Knox’s words matched her body language was when Diane Sawyer read out the nicknames the media had given to Knox, such as “she-devil with an angel face.” Knox listened to the names and then said, “I haven’t heard those,” while showing a microexpression of contempt–a one-sided mouth raise. This facial expression of hatred is in congruence with her verbal statement of being wrongly accused. See a full guide to microexpressions here.


A big red flag and mismatched body language was during one of Diane Sawyer’s most important series of questions. Here is how they went:

First, Sawyer asked Knox, “Did you kill Meredith Kercher?” Knox says “No,” very directly, with eye contact, no odd facial tics and, most importantly, a side to side head shake–the nonverbal sign of “no.” This negative head shake matches her negative statement and the absence of facial leaks is also devoid of deception.

Second, Sawyer asks, “Were you there that night?” Knox’s verbal answer is the same, “No.” Yet, her nonverbal behavior at this question is different. She says “No” then flashes a microexpression of surprise and nods her head up and down–the position of “yes.” Here her nonverbal does not match her words. There are a number of reasons why she could have shown that surprise and head nod. Occasionally people raise their eyebrows as a verbal punctuator or exclamation point. Again, not a sure sign of lying, but a definite red flag in my book.

Amanda Knox Surprised

4. MISMATCH: Swallow

Another red flag came directly following Sawyer’s question about Knox’s whereabouts that evening. Sawyer asked, “Do you know anything else you have not told police, that you have not said in this book?” First, it takes Knox a beat longer to answer this question than previous questions–never a good sign. Then she deeply swallows showing intense nerves. This question would not make an honest person nervous. So, why was this question so hard for her to answer? Another red flag.

5. MATCH: Posture

For most of the interview Knox’s posture and the way she held her hands was quite relaxed. This matches her stance of innocence and that she has nothing to hide. The only time she showed extreme nerves was during the intense swallow following Sawyer’s question about withholding information.

6. MISMATCH: Lack of Indignation and Sadness

Several times during the interview Knox verbally expressed sadness and outrage, but did not show these microexpressions. For example, Knox says that “it could very well have been me,” when referring to what could have happened had she had been home. Yet during her comments she shows absolutely no sadness or anger. When she makes the strong statement: “My friend had been murdered and it could just have easily been me,” Her face is completely devoid of emotion. She goes on and sighs, but still no facial emotion of this traumatic event. This lack of emotion does not match her strong words. Again, we don’t know if this is because she is numb from the events or because she has rehearsed these lines so she no longer shows emotion, but it is still a red flag.

7. Spot the Lie

Knox’s behavior over the past 4 years has been radically different. After all, we have watched her grow from a college girl into a woman all on the news and in court. She notes in the interview that she wishes she could have handled it all in a more mature way. Our biggest challenge is to differentiate immaturity from guilt.

Learn how to spot more lies with our ultimate guide:

How to Spot a Lie

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