BBC will air a new documentary investigation into Mo Farah & his former coach Alberto Salazar on Monday Here's a bit on USADA investigating Farah & Salazar's use of L carnitine (legal supplement L carnitine, une substance prise par Mo Farah avant le Marathon de Londres 2014 Mo Farah doctor Robin Chakraverty testifies on L carnitine use in doping investigation Panorama: Fresh questions over Mo Farah's relationship with Alberto Salazar BBC Sport Qu'est ce que la L carnitine, le produit test par Alberto Salazar sur ses athltes, dont Mo Farah? Four time Olympic champion Mo Farah lied about taking controversial supplement L carnitine before the 2014 London Marathon. : r olympics