Two bikies on trial for one of the biggest drug busts in SA history have been let off.
SA Police have spent 2 years investigating the alleged $151 million drug syndicate and 12 months in court but don't want to give up their surveillance techniques.
Their refusal to reveal anything about GPS devices attached to the duo's cars has forced Prosecutors to drop the charges.
They tried to convince both the District and Full Courts to permit the use of tracking data from the devices but failed.
It's thought they could be going after some 'bigger fish'.
The two men - aged 30 and 38 - pleaded not guilty to offences including manufacturing, trafficking and being members of a criminal organisation.