Forensic linguistic studies also thre structure of spoken conversation by examining how word choices are made to organise exchanges between people. So the forensic phonetics is the use of phonetic technique during the analysis to the sounds that applied to criminal investigation. This technique includes sound technical comparison, voice recognition, transcriptions of spoken language and inclues also the disputed speech transcription and authentication records. We know how the sound is produced by the human vocal organs but we need still a sophisticated technology which can be used to measure tone, color and sound pressure.
The written linguistic evidence or a transcription of conversation will be analyzed by linguistic theories which involve syntactic knowledge to analyze how the text is built and how is based on the structure of the language.
We see how this issue is complex and how it requires a lot of linguistic knowledge.