One of the sport's worst doping methods has not been revealed.
But soon there will be a change.
After 14 years of research, a company in Umeå has now developed a solution to the problem - and closed the loophole for the cheaters.
- It feels fantastic, says the former biathlete Anders Mannelqvist.
Read more (In Swedish)
https://www.expressen.se/sport/langdskidor/stora-genombrottet-var-omojligt-att-se/
Or in German at the cross country news portal XC-SKI.DE