Diego Dzodan was in detention in Sao Paulo after his arrest following "repeated non-compliance with court orders" to share Facebook data requested in a drug trafficking case, federal police said.
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"This information was required to produce evidence to be used in an organized crime and drug trafficking investigation," the police statement said. The probe, police said, is being conducted in-camera, meaning that it is held in court, but in secret, with no public allowed.
Brazilian media reported that the authorities are specifically targeting Facebook's popular mobile phone chat tool, WhatsApp.
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Four months ago, a judge asked for the names of two users of a WhatsApp account where information about narcotics was being exchanged, and Facebook refused, incurring daily fines, O Globo website reported.
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