Do it on a points system.
I have only ever had a single fraudulant affiliate who passed a basic fraud points system. (And he was more dumb than pure fraudulant).
Free email address = -1
Free website = -1
From Nigeria, Turkey, China, Phils, India = -2
Invalid phone number = -4
Applied from proxy ip = -2
Can't write English = -1
Invalid address = -1
Address that is on Google = -3
Has a "shonky" website = -1
Email address doesn't match domain = -1
There are a bunch of other things to look for, but if your affiliate applicant loses more than 4 points you should start worrying.
Remeber though, that you will get a few false positives with a system like this.
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