A former police worker could face jail for possessing more than 110,000 indecent images of children.
Nicholas White, 27, admitted 20 counts of possessing indecent images and two of possessing extreme images at Cambridge Crown Court today.
He worked as a communications officer employed by Cambridgeshire Police and was deployed to a unit overseen by the Association of Chief Police Officers (Acpo).
White, from Royston, Hertfordshire, had been employed since June 2008 and resigned after his arrest in February last year.
The charges cover more than 110,000 images including photographs and videos of eight-year-olds and extreme pictures of children engaged in sex acts with animals.
He was released on bail on the condition he does not approach unsupervised under-16s or access pornographic images on the internet.
Nerida Harford-Bell, defending White, asked for a psychiatric report to be compiled before sentencing, as White had a history of self harm.
She added: 'He is a very isolated individual who found himself with a growing addiction.'
Judge Gareth Hawkesworth said: 'This report should not be taken as any indication of the likely sentence."
'I keep all options, including custody, open.'
White, whose elderly father attended the hearing, will be sentenced at Cambridge in March. He covered his face as he left court.
A spokesman for Cambridgeshire Police said: 'All applications for employment with the constabulary are subject to rigorous checks and vetting, including the examination of criminal records and employment history."
'Any allegations against employees are fully investigated and disciplinary action and, if necessary, criminal proceedings, will be instigated if appropriate.'
Acpo is an independent body which brings together the expertise of chief police officers across the country.