In 2007, she finished fourth in Boston, attempting to defend her title, and was quoted as saying, "I never felt good in the cold.

[17] She came fourth at the Beach to Beacon 10K and Falmouth Road Race, but delivered her best performance in half a decade at the 2012 Chicago Marathon.

A tight duel with Atsede Baysa in the latter stages of the race resulted in her narrowly finishing as runner-up, but her time of 2:22:04 hours knocked over a minute and half off her six-year-old personal best.

Her agent Federico Rosa, a prominent name in elite marathon running, confirmed the fact but refused to reveal the responsible substance.

The second was from the International Association of Athletics Federation (IAAF), who requested that Jeptoo's ban be increased to four years, due to "..aggravating circumstances which it argues warrant an extended period of ineligibility.

"[27] On 26 October 2016, the Court of Arbitration for Sport upheld an appeal from the IAAF against the leniency of the two-year ban given by Athletics Kenya, and instead set a four-year ban, and the annulling of all results after 17 April 2014, including her wins in the 2014 Boston and Chicago marathons, citing "her deceptive and obstructive conduct throughout the proceedings" as aggravating factors justifying the maximum penalty.