One can never be too cautious about doping.
After French middle distance runner OPHELIE CLAUDE-BOXBERGER was test positive to EPO just before Doha Worlds, her mom's boyfriend (who is part of her staff) admitted to have injected her a dose of EPO while she was lying asleep after a massage. All that AGAINST HER WILL (presumably) !
While a little hard to believe, it is plausible, and the argument Salazar used for the testosterone gel is a little more valid now (someone rubbing you after a race, triggering a positive test).
What do you think ???
Sources (the second is in french):
https://www.france24.com/en/20191120-claude-boxberger-bemused-by-positive-epo-test
https://www.lequipe.fr/Athletisme/Actualites/Ophelie-claude-boxberger-innocentee/1084892