If a tenant has been evicted legally and has removed (or been given access to remove) all personal property, there is no reason for the tenant to re-enter the property again; to do so is trespassing by the evicted tenant.
Trespassing is a police matter. If an ex-tenant has collected all of his or her personal property from the location and then been told not to enter the property again yet still does, the landlord should call the police.
There is no need to state such a thing within a Lease document, as doing so is stating the obvious.
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