RhinoFish - 3:17 pm on Aug 1, 2013 (gmt 0)
+Contact an OPM, see if they'll run some tests for you (perhaps Adam Reimer). Good OPMs also know which affiliates use toolbars to drive traffic.
+Look for feedback in your Affiliate Network (though most don't have this).
+Ask Brand Verity for a trial to try out their system, it is outstanding at catching poachers (who often use things besides geo targeting to hide from you).
+Check your forums and blog for emoticon cookie spammers.
+If your Aff Network shows referring URLs, look there for clues (though most don't have this feature).