gsp and fedor were clean
Albeit they're probably micro-dosing and only getting marginal benefits from doing so.
I would say Gustafsson is clean, there is to much stigma in using PEDs in Sweden, you will baiscally ruin the rest of your life. It is not the same thing as in other countries. And you have a central agency that is uncorrupted that tests all professional athletes. Now when he is in San Diego to train the doping committe hired people in the US to make tests on him according to the standards in Sweden.