There is a difference between lack of evidence of a real marital relationship (or lack of bona fides) and
Under immigration law, a foreign national must prove to Immigration Services (USCIS) that his or her marriage to a U.S. Citizen or a Legal Permanent Resident is real and is not entered solely for the purpose of obtaining an immigration benefit. Besides the famous marriage interview that couples usually have to undergo, they also have to submit documentary evidence of their relationship (for example, utility bills on both of the spouses’ names, joint bank accounts and other joint financial responsibilities, family pictures, children’s birth certificates, letters from family and friends attesting to the validity of the couple’s marriage, etc.).
Some couples have an honest struggle finding evidence of a bona fide marriage for several reasons:
Finally, having an attorney present at an immigration interview for a couple who does not have a lot of evidence is always a good precautionary measure that helps your chance of success.