Rockstar set up a special GTA 6 team in Miami to meet with "ex-criminals, law enforcement, club promoters, gun dealers and anyone notorious or influential"

Rockstar went to some great lengths for its Grand Theft Auto 6 research, it seems, as the studio has said it sent multiple teams of developers to Miami as well as embedding a team there longer-term for research.

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source https://www.eurogamer.net/gta-6-rockstar-miami-research-team-ex-criminals-gun-dealers