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EXCLUSIVE: The former screw, who spent years in HMP Manchester, told MailOnline that some prison staff had to enter witness protection after 'upsetting the wrong person'.
Charlie Taylor said 'very sophisticated organised crime groups' were employing so-called clean skins to take roles inside jails in England and Wales.
The footage shows Kora Haley giving drugs to inmate Aneeze Williamson as she visited him at HMP Lindholme near Doncaster.
A prison mental health nurse who started a relationship with an inmate has been jailed alongside 15 others for their involvement in the UK's biggest-ever prison drug-smuggling ring.
Sixteen people are sentenced over roles in the UK's largest prison drug-smuggling ring.