Cake 2.0 NOT IN array is not working

I am using two tables with a one-to-one relationship.

Tables:

people (id,first_name,last_name)

scouts(id,rank,den,person_id)

When creating a new Scout the people.id is selected from a dropbox. I need this dropbox to only populate with people.id that are not already in a scout.person_id. I'm trying to use:

$scouts = (1,2,3);

$this->set('people', $this->Scout->Person->find('list', array('conditions' => array('NOT' => array('Person.id' => array($scouts))))));

The SQL that is generated by cake only checks the first element in the array:

SELECT `Person`.`id` FROM `db`.`people` AS `Person` WHERE NOT (`Person`.`id` = ('1,2'))

So my dropbox displays 2 and 3 when it should only be displaying 3.

Thank you in advance for any help you can provide.

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