[Spambayes] Audit SpamBayes

Hello all! New to the list and i have a "basic" question: how do you audit spambayes to make sure it has been integrated correctly and is working the way it is configured to work? The reason i am asking: i have been asked to take over/help out with a companies mail server which uses postfix/squirrelmail and spamassassin. This setup has only been in production for about 2 weeks and spambayes has only been implemented for about 1 week. Some emails that contain the words viagra and the like are coming through as ham and have been asked to audit spambayes and maybe configure some rules for spambayes.