Far North Police are being met with a wall of silence nearly two months on from a fatal hit and run. 

They've been investigating the death of 18-year-old Jahkani Hamilton last month, when he and an associate were knocked off their dirt bikes near Kaikohe. 

Police say the investigation's being hindered as witnesses and their supporters are actively choosing to say nothing. 

Defence lawyer Steve Lack told Andrew Dickens everyone's entitled to the right to silence. 

He says it's sometimes difficult to break down whether someone's a suspect, accused, or simply a witness. 

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