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*在电脑系统，即 Consular Lookout and Support System (CLASS) 里撤销
**按照法规，22 CFR § 41.122(c) Notice of revocation. Unless otherwise instructed by the Department, a consular officer shall, if practicable, notify the alien to whom the visa was issued that the visa was revoked or provisionally revoked. 但实际上有些工作人员在系统里撤销签证的时候，并没有告知当事人。所以存在极低的风险，签证在系统里被默默cancel了，且CO违法操作规定，没有发邮件或者当面告知。
*在签证上盖撤销章
有些CO也会比较通情达理的告诉你，你的签证我不撤销，你可以回美国等结果。