For future questions, many have been answered already and can be found using the search function. Here is my response to one from last year. I wrote a paper on airlines and criminal records for college and here is what I picked up talking to different companies and airlines back in 2018.
Im no lawyer but I think you will have 2 issues.
- The Refusal, and BAC of .15, both of these put you in a higher risk category with the FAA. So an AME might not be allowed to give you a medical & would be deferred to FAA (6-12m delay, + a lot of extra money for possible doctor and lawyers fees), also no guarantee they issue you a medical.
- Canada. That’s atleast another $2000-$8000 with no guarantee.
Your best bet IMO is do your research, call some regionals, be honest & humble, consider $160 AOPA membership to talk to Aviation Attorney, and then decide. A lawyer might want to know what Blood Test showed BAC was btw (if it’s lower than the .15 it could help you) I think all of us here believe it’s possible but will not be easy.
Chris F