Well he's Norwegian so he must have been clean.
I base my logic on a lot of issues learned here at the clinic. The reason cycling has had so much doping is because of all the money in the sport. And in 1994 it appears that not all teams were on the epo wagon. Relating to Armstrong trying to get his team to use Epo. Also Vaughters talked about the huge cost of epo, meaning he could not afford it himself.
Epo use in sports was cutting edge science and with huge health risks. Only the most expensive doctors had the knowledge needed. AFAIK the Italians were the ones with the knowledge first.
Cycling because of the money would be the first major adopter of a new drug. And it would take time for knowledge to spread, and the cost to go down.
The money needed for epo, knowledge and expertise would not be available for individual athletes in poorer sports like those present at the winter olympics. If epo was being used it would have to be organized from the top of a large organization.
Speedskating was a mini sport compared to cycling. I just don't see how the individual athleetes could get their hand on epo and/or the right doctor back in the winter of 94.
Now Koss was a medical student, he might have gotten knowledge through his studies and/or the confidence to try it. Though I can't remember how far in his studies he was at the time. I also question weather he could have time with all his training to do research on EPO. It would have taken a lot of time to get confident enough to try it on your self. Remember, research studies were not easily available on the web at that time. Finding the right paper to read would be timeconsuming. And I doubt Conconi published studies of elite athletes usage of epo in any journals.
Then there is the problem of getting epo. I doubt he had the money needed for black market epo. He might in theory have sneaked into some hospital pharmacy and stolen some vials. Hovewer I doubt any pharmacies would let medical students roam unsuperwised around carefully registered shelves full of expensive drugs. And had he been caught the consequences would have been huge.
Then there is the risk of anyone in the athletes system taking notice. Coaches/doctors/teammates etc.
For me one issue knawing at me was the fact that he was a medical student, and had an incredible olympics with three gold medals and 3 WR. However his results were not out of this world compared to what he had done earlier. He was already one of the favorites to win. Add to that that this was at home in the biggest event he would ever compete in, it was the perfect time to be all he could be.
So for me, I have difficulty seeing that he could have been on epo in 1994. The problems for him to acquire and use epo would be to much I think.
However an organized program involving a lot of people and money could make epo available. However keeping such a thing secret would be extremely difficult.
This is what the Italians did for the 94 olympics ofcourse. Hovewer I believe the Italians were far ahead of everyone in this field. And the secrets got out already back in 96 I think?
Note hovewer that I can't rule out anabolic steroids or something. But I think there was testing as well as out of competition testing at that time, so it certainly wouldn't have been risk free.
But this thread is about cycling so I'm sorry if I'we written to much.
I imagine he was popular in the Netherlands because it's one of their favorite sports and he was a good sportsman.

I don't think he married a speed skater, I really cant remember anything about that.