^^^Absolutely! If they didn't have a film over top we'd just have a pile of lactose and hydromorphone.
But to answer your question Sir : No.
I've had generic 1,2,4, and 8mg tabs as well as
brand name 2,4,8mg tabs and you can just crush the coating in with the powder and snort or add water to make a solution.
Have fun, those 8s are my favorite pills!