A professional doesn't know or understand the rules? BS. I've hunted in a few provinces and states. It's pretty clear that it is the responsibility of the hunter or fisherman to know the rules where they are fishing or hunting.
For example: Party hunting is allowed in some areas, not in ND. Another example: Up until recently (either this year or last) on Lake Winnipeg you could keep one big walleye, over 30" I think was the rule, per year. Now none are allowed at all.
Know the rules is everyone's responsibility right down to how much meat are you required to process for each animal..