A custody officer has admitted smuggling drugs and mobile phones into prison.
Alan Redmond, 25, passed contraband to prisoners over a four-year period while working at Inner London Crown Court, in Southwark, south London.
Redmond, of Trundleys Terrace, Deptford, pleaded guilty to conspiracy to smuggle prohibited items into jail.
At Southwark Crown Court, the ex-Serco employee also admitted misconduct while acting as a public officer.
Following a long-running investigation by the London Prison Anti-Corruption Team, the south London man was arrested on 10 December 2009, as he arrived for work.
Judge Michael Gledhill QC said: "You have pleaded guilty to serious offences and the likely outcome of this is that the offences are so serious that they can only be dealt with by an immediate custodial sentence."
The judge adjourned sentencing to a later hearing.
Redmond was given bail on the condition that he handed over his passport and would not attempt to leave the country.
A serving prisoner at HMP Brixton and a woman, 31, also pleaded guilty to smuggling charges.
The male prisoner, 28, also admitted attempting to make electronic communication while in prison.
Neither can be named for legal reasons.