Anytime you're arrested it will be recorded. The arrest will never be removed from your police record. The final adjudication of the case is irrelevant.
I'm not sure that the statement above is true.
If an arrest record is sealed or better yet expunged, how can it possibly remain?
Does it not go against the very definition of these terms?
To seal a record, completely lock away so that no one sees it.
To expunge, being to completely destroy any trace of it.
By the logic you presented, anyone who has ever been arrested of anything has a record and will have to carry that cross for the rest of their lives because of an arrest that probably came about due to probable cause that then in court was proven without a reasonable doubt as erroneous.
Who are the lawyers here, chip in why don't 'cha?
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P.S. Also, I am not a lawyer, so this is just mere speculation on my part, but if in case the logic above as stated from other posters is true, this legal system of ours is seriously flawed.