The DS156 and DS230 both ask this question in two slightly different ways (which are also different from the I-94W question, if I recall correctly). If he were to check "yes" to either of these (which he might have to do, given how they are worded), would they then deny the visa because he checked "no" on his I-94W, AND allege misrepresentation, making us essentially ineligible for a waiver?
I've read some legal journal articles on this issue, and basically the upshot is that neither the COs nor the courts interpret the mental illness provision consistently, and that is generally vague and confusing. There are maybe a handful of attorneys in the country who have any experience with this issue.
Basically, the question was vague, so my fiance used common sense and made a judgment call. It was never his intent to lie to anybody--he just didn't think he fit the designation.
It just sickens me that any of this is an issue, as my fiance is only dangerous in the minds of people who adhere to ignorant stereotypes about people with mental health problems. This arcane, prejudiced provision of the Code needs to go.

