EPO

Kenyan marathoner Brimin Kipkorir tested positive for erythropoietin (EPO) and the masking agent furosemide during an out-of-competition test in November

The athlete claimed he did not know what EPO or furosemide were and had no idea how they both ended up in his body

Emmaculate Anyango Achol was the second-fastest woman in history over 10K on the road; she was provisionally suspended in early October after testosterone and EPO were detected in multiple samples