Former Treasury Principal Secretary (PS) Kamau Thugge has opted to be a State witness in the Sh63 billion Arror-Kimwarer dams scandal case. Former Treasury Principal Secretary (PS) Kamau Thugge has opted to be a State witness in the Sh63 billion Arror-Kimwarer dams scandal case. Thugge disowns Rotich in Sh63billion dams scandal - Business Daily