North Wales Police Chief Constable Richard Brunstrom says anyone applying for a job in his force will have to sign a personal commitment to anti-racism.
His announcement cames as Home Secretary David Blunkett appointed Sir David Calvert-Smith QC, the former director of public prosecutions, to lead an inquiry into racism in the police service.
The probe into England and Wales' 43 forces was announced in October by the Commission for Racial Equality in response to the BBC programme the Secret Policeman which showed secretly-filmed footage of trainee policemen making racist remarks.
Eight officers have subsequently resigned - one of whom was from North Wales Police - another north Wales officer has been suspended.
Mr Brunstrom - who also dismissed a temporary civilian worker believed to have made a racist comment - believes his force is the first in Britain to demand that every potential recruit shows a commitment to diversity.
Pc Rob Pulling wearing an improvised Ku Klux Klan mask
It will mean that a personal letter from Mr Brunstrom will be included in recruitment packs sent to prospective officers.
And throughout all stages of recruitment, candidates will have their "attitude towards diversity" scrutinised constantly.
"Individuals may be able to hide deep-seated prejudice for a time but the organisation will root out unacceptable behaviour and enforce the strongest penalties possible," Mr Brunstrom said on Monday.
"The public arguably judge the reputation of the force as much on the attitude and behaviour of individual members of its staff as on its success elsewhere.
"We have a zero tolerance procedure for racists and sexists in the police force," he added.
In the Secret Policeman documentary, undercover reporter Mark Daly joined Greater Manchester Police as a trainee officer to expose racism and corruption.
Pc Rob Pulling, who had worked in the North Wales force's central division, covering towns like Rhyl, Colwyn Bay and Llandudno, resigned after the programme was transmitted in October.
As well as being filmed making racist comments, he was also shown wearing an improvised Ku Klux Klan mask.
Meanwhile, North Wales Pc Keith Cheshire - suspended after being seen in the BBC programme - strenuously denies being racist.