Connie,
That is one of the points....I agree. It says dry ice is unacceptable and how that can be construed as humane escapes me, but I'll move on.
I think I, and possibly others in this forum, would understand everything a little better if you just answered each of those questions one by one. This way everything is clearly understood about the differences between dry ice and canisters.
Have a nice day in Michigan. Sorry to say, I went to grad school at OSU.
Tyler