I've always been curious how they handle classified material in court. Do they have to declassify it, or let certain people in and clear them?
There are special courts and procedures for this. CIPA is the governing statutory framework. Check this out if you want to get into the weeds. Bottom line, they have special judges who are trained to deal with the special issues and circumstances which balance the competing interests of the government that want's to keep classified info safe, and the rights of the defendant WRT discovery, etc. Interesting stuff from a legal POV to be sure. These have been historically used when trying espionage cases as well.
Brett