Gun Studies: 1996 - What did the last Gun Study Conclude?

There were studies of Guns and how they impact society up to 1996.  Then compiling data about Guns and the violence with guns WAS OUTLAWED BECAUSE THE NRA specifically put language in a bill which outlawed the collecting of data.  What did that study fine?

I am thankful that President Obama is now allowing those studies to take place again.

http://theimmoralminority.blogspot.com/2013/02/the-cdc-study-into-gun-violence-that.html