Amnesty said it had interviewed more than 170 refugees and migrants in Italy since July 2015.
"They then used a stick with electricity; they put it on my chest and gave me electricity". "I can't say how painful it was". "At that point, they put my hands on the [fingerprint] machine".
The report said such treatment amounted to torture within the definitions of the United Nations Convention Against Torture.
In addition, more migrants are arriving with severe burns from being exposed to fuel mixed with sea water in the bottom of the dinghies.
Amnesty International's Italy Researcher Matteo de Bellis said: "In their determination to reduce the onward movement of refugees and migrants to other member states, European Union leaders have driven the Italian authorities to the limits - and beyond - of what is legal".
Last year, the "hotspot approach" and an emergency-relocation scheme, where the processing of asylum seekers would be transferred to other European countries, were efforts by Brussels to ease the pressure on such frontline European states.
Amnesty claimed that due to the EU's inability to shape a reliable asylum system, the approach has turned into "buzz words" and "a sticking plaster".
A 25-year-old woman from Eritrea said she had been slapped repeatedly in the face by a policeman until she agreed to be fingerprinted, and a 16-year-old boy and a 27-year-old man said police had applied pain to their genitals. However, this so-called "solidarity component" has proved largely illusory: 1,200 people have been relocated from Italy so far, out of the 40,000 that had been promised, while more than 150,000 people have reached Italy by sea this year.
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The tougher actions come as Italian authorities try to implement new European Union rules adopted past year on how to handle migrants and asylum-seekers.
He also alleged that police officers sexually abused him because he continued to resist fingerprinting.
But the testimonies released on Thursday reveal that several officials, under pressure to fingerprint uncooperative asylum seekers, and to stem migration numbers, have abused people and returned them to unsafe situations without allowing them to apply for asylum.
"People, often exhausted and traumatised from their journeys and without access to adequate information or advice on asylum procedures, have to answer questions with potentially profound implications for their futures", it said. That is determined by where their prints are taken.
"They took us to the port of Bari".
Amnesty said Alessandro Pansa, Italian Police Chief, admitted in a January at a parliamentary hearing that a "longer or shorter period of detention of migrants only depends on the taking of the fingerprints". "Italy can not take another year like the one we've just had", Renzi said.
A new report by Amnesty International, based on the testimonies of 174 individuals, suggests that Italian authorities have been using varying degrees of violence against migrants.