I just found this so there is a slim chance you might get away with it but is does say "in some circumstances" but after reading the it is does not seem like it happens that often.
Class B is domestic cultivation (not supply)
Class B is oil or hash.
A grinder to break it up before being put in to a foil will produce hash in the bottom of it and I know a guy that got done for a small amount in the bottom of his grinder