Originally Posted by
Deeg
Actually, neither was entirely right. CBP officers can indeed cancel visas without any appeal. However, it can only be done under certain circumstances, found in 22 CFR 41.122(h). Bascially, it would also require that CBP refuse his admission. Based on that refusal, the visa can be cancelled.
Not exactly. From personal experience, I can state that a B1/B2 visa can be cancelled upon voluntary withdrawal of application for entry despite no formal determination of inadmissability or refusal of entry being made.