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This is the astonishing moment inmates queue up in prison to take their turn snorting cocaine from a small table with 120 lines of the class-A drug neatly arranged on it.
More than a dozen excited jailbirds were filmed openly taking drugs in a packed corridor of the prison as others queued up in single file behind them.
A small handful of men appeared to be in loose control of the situation, making sure the noisy prisoners crowding round the table didn't knock it over and scatter the cocaine all over the floor or treat themselves to more than their fair share.
Prisoners of a jail in Porto Alegre, southern Brazil queued up in single file to wait their turn to snort a line of cocaine from a small table
One of the inmates even laughed as he posed for one of the inmates holding mobile phones in their hands after his illegal use of the drug.
The shocking images were filmed in the main prison in the southern Brazilian city of Porto Alegre.
Police have confirmed they are investigating the drug orgy, said to have taken place during a party organised by one of the gangs that control the jail.
Thirteen men are filmed snorting cocaine from the table - where the drugs are immaculately arranged in six rows of 20 lines of cocaine each - in the 90-second video which cuts off when just a handful of the 40-odd men waiting their turn have had their go.
It is believed that the video was shot at a party organised by one of the gangs that control the prison
Military police have launched an investigation which is understood to be running parallel to others by prison bosses and a regional drug squad.
Regional drugs squad police chief Mario Souza confirmed: 'We are investigating from the perspective of drugs trafficking.
'We are going to look into questions like when the video was taken as well as confirming the place it was taken in and investigating the context.'
Dozens of 'excited' inmates were filmed queuing up down the corridor of the prison and then openly taking the class A drug
Cezar Schirmer, Public Security Minister for the state of Rio Grande do Sul which Porto Alegre is part of, branded the footage 'unacceptable, provocative and nasty.'
He added in a statement released by his department: 'Cesar Schirmer has ordered a police inquiry to get to the bottom of drugs trafficking and the use of mobile phones in prison, as a result of the publication on social media of a video where inmates are consuming cocaine, supposedly in a state jail.
The drugs are immaculately arranged in six rows of 20 lines of cocaine each. Police have said they are investigating the incident
'The identities of those involved in the recording and the aspects of consumption and drugs trafficking, as well as the entry of drugs and mobiles into prison and the circumstances surrounding this incident and the place and date, are not yet clear. They need to be investigated fully and immediately.'
Prisons are back in the headlines in Brazil after nine inmates were murdered during a New Year's Day riot at the Colonia Agroindustrial semi-open prison in the central Goias state.
More than 120 people died in a string of prison riots last year sparked by a nationwide struggle between rival drugs gangs and authorities have warned of more violence ahead.
After one of the bloodiest riots last year, at Alcacuz Prison in the north eastern city of Natal, prisoners boasted they were barbecuing their victims' flesh in a sick video.
They gloated as they showed off pieces of meat on a skewer over a bonfire and claimed they were toasting the remains of a rival without even bothering to hide their faces.
In March 2016 strippers were filmed gyrating naked in front of 200 admiring males inside a maximum-security jail in El Salvador.
Inmates at tough Izalco Jail wrote to prison chiefs asking for permission for a disco and a show by a female dance group so they could celebrate a famous south American religious festival in style.
But the footage taken by a prisoner on his mobile showed the women dancers were the sort you find in so-called gentlemen's clubs, not ballet classes.