I built something a while back which used several data sources to build a scoring profile of the applicant. The emergent behaviours were rather interesting, an

I built something a while back which used several data sources to build a scoring profile of the applicant. The emergent behaviours were rather interesting, anyone with a .pl tld in their email was several penalised. The rejection rates for .pl applicants was 100% so the system worked albeit somewhat racistly.