Wetangula left his ministerial post on October 27, 2010, due to ongoing investigation on his alleged involvement in the Kenyan Tokyo embassy scandal.
Wetangula returned to the ministry in August 2011 after he was absolved from any wrongdoing by five separate probes,[3] though he permanently left the position a few months later.
Later on 30th Wednesday 2016, Former Foreign Affairs permanent secretary Thuita Mwangi and two others were acquitted of all charges in relation to the Tokyo Embassy scam.
The former PS had been charged alongside former ambassador to Libya Anthony Muchiri and former chargé d'affaires in Tokyo Allan Mburu.
They were charged with abuse of office in procuring the embassy and ambassador's residence in Tokyo at a price of Sh1.4 billion, and for failing to involve the ministerial tender committee in approving the purchase.