Three Jubilee agents were arrested while conducting a tally of voters outside a polling station in Thika town on Tuesday.
The two women and one man were caught with a book filled with the names and contacts of voters at Heshima Primary School polling station.
Thika deputy OCPD Bernard Ayoo said residents raised concern about their presence at the station.
"We verified that they had Jubilee agent cards and that they were conducting a tally to determine voter turnout," Ayoo said.
He noted that while it is not an irregularity or malpractice, tallying voters at polling centres is not allowed.
Area MP candidate Patrick Wainaina asked police to check the status of the three as bona fide party agents.
"The three were actually bribing voters and then taking their names and numbers," he claimed. "We want the authorities and returning officer to take up this matter."
In Kisii, dozens of prisoners protested after they were unable to vote because their biometrics could not be captured.
They accused the IEBC of mischief and asked official to sort out the matter.
"We are reading mischief in this. First of all, the number of voters registered here was more than 200 yet we are now being told only 98 will vote," inmate said Wesley Osogo.
Joshua Atura said: "They should use a manual register or any other back up. We want to vote."
Presiding officer Jared Nyambati said by 11 am, 10 prisoners had been barred from voting because the machines failed to read their finger prints.
"47 prisoners out of 98 have cast their votes so far," he said.
In the women's prison, only three people voted.
Nyamira Senate candidate Okong'o Omogeni (ODM) protested after his two children and his mother were turned away as their names were not in the register.
"They all have the Mogeni name in their IDs and are not in the register. I think there is some mischief here. This selection is a sham."