They are not protected from criminal prosecution in most cases under the FMS program; I am surprised they aren't being prosecuted. With that said, I wonder if one of three things happened:
- Whatever warrant they had to search for these kids didn't include searching for whatever kind of files turned up the child porn or something like that.
- Some higher level diplomacy has been worked out.
3., and most likely, the Saudi students have exceptions to certain criminal prosecution - all the courses from DSCA generally teach: "this applies to everyone!!! Oh, except Saudis, they have a loophole to this that we won't address here."