How will a petty theft affect my filing for citizenship? 3 Answers as of October 28, 2011

First question is when did the petty theft occur. I would need to review a certified copy of the Court documents but it sounds like you got some type of court supervision or diversion program. If you completed all requirements, it may not hurt you but if YOU ARE UNDOCUMENTED you are subject to removal at any time and this type of incident would make ICE much less likely to exercise prosecutorial discretion. You have not given me any facts to determine your eligibility for permanent residency but normally would need a sponsor. These cases are quite complicated and lots of facts matter. Ii recommend you schedule a consultation to learn your options. We do charge for consultations but any fees paid would then be credited toward the fees for your case if you are eligible to file for any immigration benefits thereafter.

One petty theft will not affect your permanent resident application. Two will. Any criminal conviction within the statutory period for filing for naturalization will affect your chance for citizenship. But it looks like you are ahead of yourself because you are not US permanent resident yet.

You seem to inquire about an application for permanent residence not citizenship. You should have an experienced immigration lawyer review the disposition. It appears from what you write that the offense does not have an impact. It is also problematic that you are "undocumented". Again see a good lawyer if you want a reliable answer.