Chinese citizens get 6 months B visa from US consulates, so their visa stamp (valid in 2002 March) must have been expired for one year already. and therefore not eligible to waive interview.
If they hold other country's passport, they would have gotten 5 years or 10 years B visa or even visa waiver, but then you would not need to ask visa question now.
If they hold other country's passport, they would have gotten 5 years or 10 years B visa or even visa waiver, but then you would not need to ask visa question now.