How does the police investigation use different methods of qualitative discourse analysis to conduct the investigation of the following financial crimes and how does these analyses describe perceptions and insights of the legal, cultural, societal and power dynamics within the courtroom:

- R v John Hartman and James McCartney

- Commonwealth v Gatto

- R v Eugene Liu

- ASIC v Fortescue Metals Group Ltd

P.S: No Reference as it is a general question.