Can do conditional validation by credit card type except for VISA

I'm trying to put conditional validation in my form that validates a
correct CC is used depending on what CC was selected. Using the code
found at http://bakery.cakephp.org/articles/view/conditinalvalidation-behavior.
Seems to work for MC and Discover but not when I select VISA. If I
select VISA and put a wroThe Master Card number you supplied was
invalid.

Can anyone help?

In my Order model:

var $validate = array(
'cc_card_number' => array(
'creditCardNumberRule1' => array(
'rule' => 'notEmpty',
'message' => 'Credit card number is required.'
),
'validVisaNumber' => array(
'rule' => array('cc', array('visa'), false, null),
'message' => 'The Visa number you supplied was invalid.'
),
'validMCNumber' => array(
'rule' => array('cc', array('mc'), false, null),
'message' => 'The Master Card number you supplied was invalid.'
),
'validDiscoverNumber' => array(
'rule' => array('cc', array('disc'), false, null),
'message' => 'The Discover number you supplied was invalid.'
)
),
...

var $actsAs = array(
'ConditionalValidation' => array(
'restore' => true,
array(
'condition' => 'isCardVISA',
'remove' => array(
array(
'cc_card_number' => 'validMCNumber',
'cc_card_number' => 'validDiscoverNumber'
)
)
),
array(
'condition' => 'isCardMC',
'remove' => array(
array(
'cc_card_number' => 'validVisaNumber',
'cc_card_number' => 'validDiscoverNumber'
)
)
),
array(
'condition' => 'isCardDiscover',
'remove' => array(
array(
'cc_card_number' => 'validVisaNumber',
'cc_card_number' => 'validMCNumber'
)
)
)
)
);

function isCardVISA()
{
return (($this->data['Order']['cc_card_type'] == 'VISA') ? true :
false);
}

function isCardMC()
{
return (($this->data['Order']['cc_card_type'] == 'MC') ? true :
false);
}

function isCardDiscover()
{
return (($this->data['Order']['cc_card_type'] == 'DISC') ? true :
false);
}

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