Ten of the shortlisted candidates were interviewed by the National Police Service at the Kenya School of Government.
They subsequently withdrew to analyze their performance and confer awards before announcing the top three winners.
The three were given to the president, who chose Amin as his replacement.
The contenders were grilled about their riches, experience, reasons for wanting to be the DCI, and what they could provide to the position.
The DCI’s primary responsibilities include gathering and providing criminal intelligence, conducting investigations into serious offenses like murder, drug trafficking, money laundering, and economic crimes, upholding law and order, and detecting and preventing crime.
Additionally, they detain criminals, keep track of criminal histories, organize national Interpol affairs, and conduct inquiries into cases that the Independent Police Oversight Authority may send to them (IPOA).
To fulfill their mandate, the personnel are currently stationed at various government agencies.
The primary DCI units include, among others, the Anti-Terror Police Unit, the Anti-Narcotics Unit, the Regional Interpol Bureau, the DCI Academy, the Bomb Disposal Unit, and Banking Fraud.
Amin will succeed George Kinoti, who left his position last month.
Ruto announced it in a gazette notice published on October 14.
Amin Mohamed is appointed as the director of DCI by William Ruto “in the exercise of the authorities granted.” the message stated.