If you have an independent witness or other independent proof that you were not at the approximate location, at the approximate time, of the alleged offense written on the ticket, you might have an issue to argue. However, in most instances the court will allow the governmnet to amend anything on the ticket even during trial. Usually you would allow the government to put on their case. After they "rest", having put on all of the evidence they care to present, then you would produce your evidence that you were not at the location at the time alleged. Unfortunately, there is only a small probability you would prevail on these facts.
Contrary to popular belief, errors on tickets/summons do not require an automtica dismissal of the charges. Mr. Pirosko is absolutely correct in his legal analysis of the issue.
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