This process is very easy:
Visit a police station in your county and ask to the CID offices.
Carry with your your original ID and a fee of ksh 1000.
On making the payment you are issued with a receipt and directed to proceed to the photocopy and finger print center.
Follow instructions as issued to you.
Lastly you are issued a copy of a serialized receipt.
Collect your Certificvate of good conduct on the dated indicated on the receipt.