You need to sit down with an experienced immigration attorney in your area before your wife files your case.
All arrests/convictions can have an impact. An experienced attorney to help determine what you can expect and how best to prepare your case.
You can obtain referrals for attorneys in your area from this site or from www.aila.org
I agree with Mr. Taylor.
PROFESSOR OF IMMIGRATION LAW for over 10 years -- This blog posting is offered for informational purposes only. It does not constitute an attorney-client relationship.
When applying for citizenship, the government will look at the last 5 years of your life to determine whether you have "good moral character." Good moral character is defined in the Immigration and Nationality Act, case law, and administrative memorandums. Certain criminal offenses can preclude a finding of good moral character. Even if the case was dismissed, if the government (USCIS) determines that you made an admission under the law to the elements of the offense, they can make a determination that you lack good moral character under the law. Also, certain dismissed cases could be considered convictions or admissions under immigration law that could make you deportable under the law. Anytime you have a prior criminal case and are applying for benefits with USCIS, you should consult with an immigration attorney to determine whether that criminal case will have negative immigration consequences.