Also during races with termal cameras https://arstechnica.com/gadgets/2016/06/tour-de-france-unveils-measures-to-catch-cheats-with-hidden-motors-neodymium-magne

Also during races with termal cameras https://arstechnica.com/gadgets/2016/06/tour-de-france-unveils-measures-to-catch-cheats-with-hidden-motors-neodymium-magnets/ https://arstechnica.com/gadgets/2016/06/tour-de-france-unvei...