routing — duplicate content and SEO concerns

With some simple routing:
Router::connect('/items/*', array('controller' => 'items', 'action' =>
'view'));

URLs like this are possible:
http://domain.com/items/slug-here

The problem, is that these are also valid pages that exactly duplicate the
above page:
http://domain.com/items/slug-here/unlimited
http://domain.com/items/slug-here/unlimited/duplicate
http://domain.com/items/slug-here/unlimited/duplicate/urls

What is the best way to address this issue so that there is not a duplicate
content problem?

In each controller action, I could check to see how many parameters were
passed, and if there are more than expected, redirect to a 404. Seems like
there should be a way to handle this in the routes.php file though.
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