HI there. I think you are talking about a possible future amnesty or DREAM Act. Generally, the US immigration law provides exceptions or waviers for petty offenses. Hopefully, this is a petty offense and that any new amnesty program will provide an exception or waiver for it. Best regards.
Good moral character is not a requirement for legal residency.
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DREAMers turned into DACA, which is a current immigration benefit. Generally, a finding of not guilty should not disqualify him for DACA unless perhaps he confessed. You should consult privately with an immigration attorney to see what is possible.
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