Yonason Pollard - To free or not to free Is that the Question??

In another forum this issue came to a big discussion.

I think we need to step back a minute and ask the question " Do we have enough information to make this decision"? or even speculate.

The arguments are: He is a Jewish Neshama and we all should have Rachmonis and the issue of "Pidyun Shvuyin", and of course whether or not he deserves such a "harsh" punishment. On the other hand we have no access to any/all classified information that was compromised.

I think we need to first look into the Halachos of "Pidyun Shvuim", which I am not so well versed in. I would like to know the implications and when to apply Pidyun Shvuyim. If someone could provide us with this information.