Don't know if it's truly random but all I could get from ce hard was the word, no fangs. Finally got a fang, now they drop every time. I also get the same exotics over and over. Lucky for me that includes gally, gotten 3 so far. Dunno how many hawkmoons, etc. I get the same ones over and over, same with bounties. Invective bad juju and thorn over and over. I'm actually only missing suros hard light, and sga. I think it's weighed random.