父母绿卡申请同一个信封2018年2月中旬寄出，5月中旬收到补充材料的通知。父母需要补充健康检查。补充材料父母又是同一个信封五月底寄出。父亲绿卡7月初寄到，母亲的绿卡至今仍无回音。
请教8老师及各位：
1. 后来打电话查询母亲绿卡状态不更新的原因，回复是“we have placed your case on a processing hold because the required security checks remain pending. until we receive the results of these security checks, we cannot move forward with your case.”请问这种情况是否还在正常的程序范围内？
-Yes, it is very normal. So, just be patient and wait.
2. 是否有类似案例，绿卡背景调查还需要多久才能完成？
3. 这样的情况，申请ap回国等绿卡会有风险吗？-No. But if there is any interview later, don't miss it.
多谢8老师及各位！
