Seven officers were on Wednesday found unsuitable to serve in the police force.
The seven were among 31 officers who required further investigation following the vetting exercise; the other 24 were cleared.
The NPSC found that Superintendent of Police Nelson Nyakundi used someone else's documents to get recruited into the service.
He passed vetting and served 22 years, rising through the ranks undetected. NPSC chairman Johnston Kavuludi said he had been cleared and found competent.
"But members of the public and some officers informed us he forged documents, prompting fresh investigations," Kavuludi said.
"His certificates suggest he sat for KCPE at 10 years, which is not possible. Investigators went to his village and found family members knew him by a different name. There is another Nelson Nyakundi somewhere."
The National Police Service Commission boss said Nyakundi's details have been forwarded to the DCI for investigations.
"We are sure there are other officers in the service who did not meet basic qualifications or used other people's papers. The commission is working on it and will dismiss them," he said.
Others who have been fired are:
1. Lawrence Martin Kariuki ,
Rank Senior Superintendent of Police (SSP)
2. William Meto Kiprotich,
Rank Senior Superintendent of Police (SSP)
3. Joseph Kipkemboi
Chemeli,
Rank
Senior Superintendent of Police (SSP)
4.Peter Kemboi Chemos,
Rank Assistant
Superintendent of Police(ASP)
5. Samuel Bore Kipwese,
Rank
Superintendent of Police (SP)
6. Jackson Muriuki Mugambo,
Rank
SP
7. Jackson Olentutu Olenkiti,
Rank
SP
A source within the vetting board who sought anonymity said several officers had tried to avoid the exercise by bribing the management but were unsuccessful.
Kavuludi had said the names of officers who appealed for a review of their results would be revealed by next week.
The commission intends to vet traffic police officers, especially those who have been linked to corruption allegations, he said, in a bid to change the image of the force.
"The exercise will be open. We will be keenly interested in traffic officers since they have a bad image due to corruption claims," he said.