I mean, if you look at the way the exception is written, it's very broad, and the guidelines that have been issued talk about a lot of different kinds of evidence as acceptable. That's not the issue.
The issue is, no matter what you do, no matter how you change that guideline, you still have to tell a woman who comes into your office, “You're going to have to apply and ask somebody to decide whether or not you meet the exception”, so that's the decision. Even if a reasonable person would say, “Of course you fit this exception”, they still have to report themselves and they are, then, at risk of possibly losing their status. A lot of women will not make that choice. On top of that, you have people who just don't even know that there is an exception, and have only heard that they have to stay and can't leave for two years.
It just causes, for what...? There is no evidence that it actually curbs marriage fraud, and we have other tools to deal with it.