Kisii DG was arrested at Kisii High School as he waited to welcome Deputy President William Ruto.
Police say that the DG was planning for a chaos at the funeral of the late politician.
Ruto is expected to attend the burial of Gusii politician Simeon Nyachae.
An aide said detectives ordered Maangi to enter their car before they sped off to the DCI offices in Kisii town where they are grilling him.
The Star reported that County Police Commander Jebel Munene could not be reached by phone as his phone remained off.
“We don’t know why they arrested him. They did not give a reason why they were picking him for, they only told him to enter their car before they left to Central Police Station where they are interrogating him,” said an aide.
The arrest of the Deputy Governor comes a day after a former ODM branch executive Samuel Omwando was arrested from his house in Nyanchwa.
Joash Maangi is the chair of Tangatanga wing in Kisii.