Immigration lawyers say scrutiny of marriage-based green card applications in the US has been tightened in recent months, with applicants facing tougher scrutiny during interviews and increased enforcement action even at the interview stage. Marriage is one of the most common routes to permanent residence, but lawyers warn that the process is now being scrutinized more closely than before.According to immigration attorney Douglas Lightman of Lightman Law Firm LLC in New York, “Obtaining a green card through marriage is one of the most common routes to lawful permanent residence in the United States. It is also one of the fastest routes to permanent residence, with some applicants receiving approval in just 9 to 15 months.”However, he and other lawyers note that this is one of the riskiest routes, as applicants must clearly prove that the marriage is genuine and not undertaken for immigration benefits.A marriage-based green card allows the foreign spouse of a U.S. citizen or lawful permanent resident to live and work anywhere in the country. The type of green card issued depends on how long the couple has been married at the time of approval.Attorney Lightman explains that there are two main categories. A 10-year green card is issued to spouses who have been married for more than two years when their application is approved. It is also known as IR-1 visa. A 2-year conditional green card is issued when there are less than two years left before the marriage can be approved. This is known as a CR-1 visa and the couple must later file Form I-751 to have the conditions removed.US citizens can often file Form I-130 and Form I-485 together for faster processing, but spouses of green card holders usually have to wait longer due to visa limits and quotas.Eligibility rules will remain strict. Immigration attorney Matthew Curtis explains, “The marriage must be legally valid with a government-issued marriage certificate. USCIS recently updated its policy to clarify that only marriages that are legally recognized and registered with civil authorities are eligible. Both spouses must be legally free to marry, all previous marriages must have been properly ended through divorce, annulment, or death.“In addition to the paperwork, applicants must also meet a standard known as the bona fide marriage standard, which is often the most closely scrutinized part of the case. “USCIS examines whether you and your spouse share a life together through financial entanglement, cohabitation, and emotional connection. The burden of proof is entirely on you,” says Curtis.Couples are expected to present strong supporting evidence. “Joint financial accounts demonstrate financial interdependence,” says Lightman. Housing documents proving that you live together. Photos spanning the period of your relationship document the time you spent together. Affidavits from friends and family provide third-party verification. Travel records, communication records and receipts from joint purchases all strengthen your case.“At the same time, lawyers warn that some factors may raise alarm bells. “Things like significant age difference, limited shared language, immediate marriage after very short courtship, living at different addresses, minimal joint financial documentation, and previous marriages to U.S. citizens warrant increased scrutiny,” says Curtis.Financial needs also remain central. Lightman explains that sponsors must prove they can support their spouse at 125% of the federal poverty guidelines, which requires an income of about $25,550 for a two-person family. If this is not met, applicants may rely on a joint sponsor, joint household income, or qualifying assets.