Also does the Immigration have to see a clean record from the F.B.I. before they can approve a application?
Usually a couple of months. You record does not necessarily have to spotless. However, if you have a conviction (or convictions) for a crime of moral turpitude, a controlled substance offsense, etc., this could affect your eligibility for immigraition benefits.
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I agree with the lawyer.
If you have concerns with your criminal record, discuss this with an immigration lawyer.
You do not need a clean record, however be aware of any criminal conviction that could subject you to deportation and address that issue accordingly.