Remove Custom Post Type menu for non-administrator users.

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Codex – Register Post Type

See the capability_type and capabilities arguments for register_post_type.
You can pass the capabilities argument an array of capabilities to map to the necessary caps, here’s an example of the args array with custom capabilities.

$args = array(
    'labels' => $labels,
    'public' => true,
    'publicly_queryable' => true,
    'show_ui' => true,
    'query_var' => true,
    'rewrite' => true,
    'capabilities' => array(
        'publish_posts' => 'ADD_CAP_HERE',
        'edit_posts' => 'ADD_CAP_HERE',
        'edit_others_posts' => 'ADD_CAP_HERE',
        'delete_posts' => 'ADD_CAP_HERE',
        'delete_others_posts' => 'ADD_CAP_HERE',
        'read_private_posts' => 'ADD_CAP_HERE',
        'edit_post' => 'ADD_CAP_HERE',
        'delete_post' => 'ADD_CAP_HERE',
        'read_post' => 'ADD_CAP_HERE',
    ),
    'hierarchical' => false,
    'menu_position' => null,
    'supports' => array('title','editor','thumbnail')
);

You’d of course replace ADD_CAP_HERE with a capability. If you wanted to limit this post type to admins, simply use a capability only admins have, such as manage_options.

Table of roles and their caps(for quick reference).
http://codex.wordpress.org/Roles_and_Capabilities#Capability_vs._Role_Table

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