This article contains child abuse charges some readers may find distressing.
Monday's instalment of 24 Hours In Police Custody saw the force's Internet Child Abuse Investigation Team track down and arrest a man who was suspected of accessing indecent images of children online.
Police arrested Asim Hussain, 32, in his family home in Luton after receiving information of his crimes, and they found a number of devices in his possession holding child abuse images.
And not only did the team find 54,000 indecent images of children ranging from the more serious category A to category C, police also found Hussain to be in possession of £160,000 worth of drugs and cash.
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Hussain was sentenced to six years in prison for drug related charges, receiving an additional 18 months for making and distributing indecent pictures of children.
Investigating officer Nicky Owen from the ICAIT has now revealed the emotional toll investigating child abuse can have on police.
She said she'd seen "the worst things imaginable" during her work to catch paedophiles, and couldn't forget the faces of those seen in child abuse images.
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"All these children that don't have a voice - we are there to stand up for them," Nicky told the BBC. "There's not much that shocks me any more. I've seen the worst things imaginable."
She added: "What could be more shocking than that? I can't think of anything.
"There's a particular girl... Her face always pops into my mind."
Hussain was sentenced at Luton Crown Court last month on 11th February for making and distributing child abuse images.
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Nicky said on the show: "Online child sex abuse is not victimless. The viewing and sharing of indecent images is a crime which causes real harm and severe trauma to countless children.
"As with many cases, this took an unexpected turn as we uncovered a number of other offences which took the investigation in a completely different direction.
"I'm pleased that through this particular case we are being given a platform to showcase the work we do within our team and will hopefully send a strong message to any would-be offenders that we will do all we can do bring such perpetrators to justice."
24 Hours In Police Custody continues on Monday at 9pm on Channel 4.
Topics: TV News