I had a petty larceny plea - down to a disorderly conduct. Will this violation show up on a background check?
Criminal Defense Attorney
It will seal but when it seals depends on what your sentence was. If you did anything that required a Conditional Discharge such as community service, it will not seal until 1 year after the sentence date. If you just paid a fine (not the court surcharge) it will seal upon payment.
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Employment / Labor Attorney
It should be sealed 1 year after your plea but the arrest often still shows up in which case you may have have to pay a criminal lawyer a small fee to have it expunged.
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My colleagues give you good advice, but please keep in mind that certain high level background checks such as for Federal employment are likely to turn up even a sealed disorderly conduct.
This answer does not constitute legal advice and you should contact an attorney to confirm or research further any statements made in this answer. Any statements of fact or law I have made in this answer pertain solely to New York State and should not be relied upon in any way in any other jurisdiction.