Prevent Form Spam with SpamFilter.cfc

One way I've found to knock out nearly 100% of form spam is to have the template that handles the results of the form check for your domain in the referrer, otherwise I redirect back to the form. It seems to knock out most of the bots and is only two lines of code.

Somehow it is not working for me. No matter what I input isSpam() returns false, just wondering if I need to do any configuration so the filter will work.
Here are the debug query I got from submitting the form:

SELECT Table_Name FROM INFORMATION_SCHEMA.TABLES WHERE Table_Type = 'BASE TABLE' AND Table_Name <> 'dtproperties'

SELECT   TOP 1 * FROM [spamWords]

SELECT [spamRegExs].[RegExID] , [spamRegExs].[RegEx] , [spamRegExs].[Label] , [spamRegExs].[points] FROM      [spamRegExs] WHERE      1 = 1

SELECT [spamWords].[WordID] , [spamWords].[Word] , [spamWords].[points] FROM      [spamWords] WHERE      1 = 1

Last 3 query looped several times. Please advice.

Thanks,
Bill

interestingly, no matter what i type in the contact form at http://www.bryantwebconsulting.com i get returned with "this message appears to be spam"