The United States citizenship and Immigration Services interviews couples separately, creating what the New York Times described as a Kafkaesque procedure reminiscent of TV quiz games to see if the couple knew what color toothbrush each partner had. There is a special procedure for those where the first interview raised an issue of the marriage being a fraud. THis office employs twenty-two officers, and they don't have any specific rules, expertise, or statistical evidence to determine which marriages were fraudulent or not. Just interesting phrases like, I should not be able to know more about your husband in fourty-five minutes than you do.
I wrote earlier about Using sortition juries for all aspects of immigration. And I don't see how twelve randomly selected citizens could be any less logical or scientific in making these important decisions, both for the nation and the couples involved.