You need to have a ticket on premises or you are guilty of criminal trespass. Even with a ticket, under some circumstances, you can be guilty. Usually there is a fine involved, although in some circumstances a short time in lock-up or jail is involved.
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No one can know what the record is in the case because online we cannot find out any details. Check with a lawyer in your locale to discuss more of the details.
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Criminal trespass involves being in a location where signs prohibit entry or remaining in a location after having been requested to leave. Hire an attorney or request a public defender if you are indigent.