C'mon guys. This is NOT a new law. Anyone who has been riding since the late 1990's has to have read this law if they have ever read through the law book. I teach snowmobile safety classs and I absolutely drill it into the kids that they need to have their certification with them when they ride only until the day they die. I tell them this at least 4 times during the course. I also enforce this law. My daughter is subject to this law, and she is 23 now. Still makes sure she has her certificate with her if she's out riding. There is no way to check on the side of the trail if someone has the certification or not. It's not a big thing. Just put the dang thing in your wallet and leave it there. If you lose it, go on the DNR website and order a new one. It is not the fault of the DNR that they didn't have their certificates with them. I don't love writing tickets to young riders- or any of them- but we do have a job to do. Snowmobile Safety is an important thing and having the card with you is no more difficult than bringing money with you when riding.
Requiring any person who can fight and die for their country to have to carry a card around IMHO is a stupid law. Take a class is one thing but carry a card all the time is a little bit childish.