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rmurphyrmurphy 

Inserting and guaranteeing unique records/leads

I would like to know if it's possible to guarantee the uniqueness of a lead in SalesForce. I need to use something like SSN as the key. The situation is as follows: A user expresses interest in a car loan and provides his/her SSN to see if they qualify for a special rate. This lead would be inserted into SForce via "Web2Lead". If they qualify, I would then send them to a custom page that would extract their info from SF and update it with additional information (credit app fields). Obviously I only want to create one application per SSN so I have to be sure it's unique.

Has anyone done anything like this or have an idea as to how it can be done.

Thanks!!!