The inmate at the George Motchan Detention Center complex – whose name has not been reported – was allowed to see a visitor earlier in June, according to PIX 11.
The prisoner, who is serving time for armed robbery, is a known member of the notorious Los Angeles Bloods street gang.
He had been placed in solitary confinement inside the prison, according to a source.
But in the footage sent to PIX 11, the inmate is taken to a private room and later joined by a female visitor.
There are no prison officers in sight throughout the visit.
After a few seconds, the inmate is seen touching his female visitor intimately, eventually putting his hands inside her underwear.
The visitor then gets down to her knees and performs oral sex on the man.
During the shocking interaction there are no appearances by a Department of Correction employee, who was supposed to be sitting in on the visit.
According to department policy, the only physical contact that is allowed to take place during prison visits is a short embrace or kiss at the beginning and end of each session.
The department has now said the matter is “under investigation”.
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“He is not only responsible for the inmate in solitary confinement who gets a visit, but he is also responsible for 50 other inmates,”
He defended the officer who walked away from the visit in question, saying prisons are too short-staffed.
Concerns have now been raised that illegal contraband – such as mobile phones or weapons – could have been passed to prisoners in such unsupervised circumstances.
Since the release of the video, the female visitor has been banned from visiting Rikers Island and other New York prisons for 365 days.