Smokin Wanjala

In September 2017, he was one of four judges who voted to nullify President Uhuru Kenyatta's win in the August 2017 presidential election.

When the first round of the presidential election took place on March 4, 2013, it resulted in the two frontrunners, Uhuru of Jubilee and Raila of CORD, clinching 50.6% and 43.7% of the vote respectively. Uhuru Kenyatta was declared the president-elect of Kenya by the Independent Electoral and Boundaries Commission. Raila Odinga challenged this in the Supreme Court of Kenya. Wanjala was one of the six judges who dismissed the petition on March 30, 2013. The highly awaited verdict, given amid great tension in the country, was rendered in favour of Uhuru Kenyatta and was unanimous.

In June 2012, he was among five justices nominated to the inaugural bench of the Supreme Court of Kenya by the Judicial Service Commission (Kenya) which had interviewed 25 applicants.

Wanjala served as a deputy director in charge of prevention of the now defunct Kenya Anti-Corruption Commission. He was appointed to the position on 9 September 2004 for a period of five years and was responsible for Research, Policy and Preventive Service. He resigned on 18 September 2009 due to public outcry following the irregular reappointment alongside his boss Aaron Ringera and fellow deputy director Fatuma Sichale by President Mwai Kibaki.