How to limit access to a view based on the contextual filter
If you are using Drupal 7 and Views 3.x, then for each contextual argument, you can specify a validation criteria from the Views UI. Look for this checkbox under the When the filter value IS in the URL or a default is provided section for a given contextual argument.

Suppose your committees are taxonomy terms in a vocabulary, say, Committee, then you can use the Taxonomy term validator. Otherwise, you can simply use the PHP Code validator and key in the custom logic that defines access to your view.

Think of this custom logic as a boolean method from which you can access the view object and the raw value of the argument and then based on this context, allow or deny the current user's access to your view accordingly.