如果你的无犯罪证明没有超过6个月，你还是可以用作父母退休类别的申请。
You can use your existing police certificate(s) if they are no older than six months when you lodge your PRC application.
如果你决定在分配审理官员前体检或作无犯罪证明，我们建议你在你递交了申请3月后再进行。
If you decide to undertake these checks before being allocated a case officer it is suggested that these checks be initiated when allocation dates are within three months of your date of lodgement.
但是美国大使馆已经表示自2008年8月31日起，对于移民和其他签证申请，他们只接受ACRO的无犯罪证明。
Please note that the US embassy have indicated that from 31st March 2008 they will only accept the ACRO police certificate for immigration and visa purposes.
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