the wife is trying to sponsor the husband but the husband has a record of being deported from the united states for drug possession. the officer in return would deny the sponsorship because in the notes it would say, husband having previously been deported from the united states for a crime involving drugs makes me believe he married wife only so he could enter canada. if these are the officers notes, where in the operations bulletins or manuals or other thing that you mentioned might one find this loophole in the law then assuming we could call it that? could the officers discretion be a loophole in the law that allows him this discretionary power? lets assume that the officer wrote this being the main reason why he denied the sponsorship, where would be basing this on what the law is allowing him to use his discretion assuming these were the notes?
As I have said multiple times: first, you need to resolve your inadmissibility by applying for and getting criminal rehabilitation.
If you have been criminally rehabilitated, your issue of your drug charge has been addressed. (I do not know whether or not that would address the deportation in the eyes of IRCC, as that might be considered a separate violation of different laws, but that's a question for a consultant or lawyer.)
So, my understanding is that, if you have been criminally rehabilitated in the eyes of the Canadian government, the officer cannot deny your immigration application (whether it be sponsorship or something else) because of your criminal history (unless, of course, you have committed new crimes...). If your outland sponsorship application was denied because of your criminal history
after you have been criminally rehabilitated, I believe this would be grounds for an appeal (though that is a question for a consultant or lawyer) because the officer is not supposed to be concerned with this issue that has been satisfactorily resolved, but rather whether or not your marriage is legitimate (which is another question).
Does that mean an officer couldn't have suspicions that your marriage isn't legitimate because of something related to your past (the deportation, the posting questions about how to get into Canada through marriage on public forum before you've met someone...)? No, of course it doesn't.