Ashutosh, a student of the Film and Television Institute of India, was released on a conditional bail later.
Some hundred-odd members of civil society, including AAP workers, staged a protest outside IFFI venue against the shoddy probe into the mysterious death of the Catholic priest and social activist Bismarque Dias earlier this month.
The police had initially said it was a case of drowning, but due to the public pressure, Chief Minister Laxmikant Parsekar this week handed over the probe to Crime Branch.
Ashutosh's only crime was that he was wearing a T-shirt bearing the name of FTII. He was at IFFI venue legitimately as he had a delegate pass, advocate Albertina Almeida claimed.
The police spokesperson said it was a preventive arrest. He, was released on vail later along with other FTII students, Kislay and Shubham, who were arrested yesterday for shouting slogans against the Centre at IFFI venue.