Married at First Sight expert Dr. Pepper Schwartz is opening up about the casting process, including red flags that could ruin a prospective participant's chances of starring on the Lifetime series.

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Dr. Pepper, a sociologist who has been with the show since it premiered, explained to E! News the make-and-break traits she looks for when casting people to marry at first sight.

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Ahead of Married at First Sight's Season 7 premiere on Tuesday, Dr. Pepper said she's most interested in finding a person with coachability.

"Somebody who's willing to take advice," she elaborated, noting each expert looks for different things. "I'm looking for heart, for warmth, for the ability to empathize with someone else."

The two other experts are Dr. Jessica Griffin and Pastor Calvin Roberson.

"It's also about trying to pick people who are earnest and kind. You don't have to be honest and kind and you still might have a terrific match, we really want people who are authentic about their reasons for doing this and are full of heart in terms of the rationale for doing it," Dr. Pepper explained.

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In terms of red flags, she told E! news her biggest concern is a person "looking for some fame of some sort. For somebody who really thinks this is a way to some kind of career path, I think there are easier and less risky ways!"

Other issues include inconsistency during the interviewing process and people "who have a lot of anger" or are "obsessive on some issue," which could signify he or she may need "much more therapeutic intervention than we're able to do even in this hyper-analyzed process."

Dr. Pepper recalled, "I interviewed somebody once where I never got time to ask a question because they never took a breath!"

Despite producer influence and requests, Dr. Pepper assured the website the three experts have final say on whom will star on Married at First Sight every season.
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"I know it's not believable because there are a lot of other productions out there where it's highly scripted and controlled, but I can give you 100 percent of my word that we get the last word," she revealed.

"While the producers definitely have opinions and they will give them, ultimately, it's up to us and we have gone against the producers' desires lots of time."

Since the show debuted in 2014, only four of the 18 married couples have stayed together, but Dr. Pepper remains optimistic.

"It's one of those things where you're very proud of yourself for the ones you forecast correctly and you try to re-examine yourself about why didn't it work when it doesn't," she explained.

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"There are some circumstances where you just read somebody wrong. We forgive ourselves. But often it's because people read themselves wrong."