Bottle shop owners who are preventing walk-in cask wine sales at Port Augusta remain tight-lipped about the mysterious trial.

Customers who walk in to drive-through bottle shops in the town are required to show identification when purchasing cask wine.

Customers' names, their address and purchases are being recorded and kept on a register, which the ABC has been told can be accessed by South Australian Police and the Commissioner for Consumer and Business Services upon request.

The procedure was initiated by Ian's Western Hotel and at a recent meeting of the Port Augusta Alcohol Management Group, all other outlets in the town agreed to a 12-month trial.

The ABC has also been told the trial did not extend to customers who drove their vehicles into the outlets.

Speaking on condition of anonymity, a person involved in the trial said the procedure "overwhelmingly impacts" the local Indigenous community.

Only walk-in customers

Another said it had not been explained why the trial was only applicable to walk-in customers and not drive-in customers.

The chair of the Port Augusta Alcohol Management Group, Jo Newell, said while the group supported the trial she was not in a place to comment further.

South Australia Police refused to comment on the trial or whether they used customer information for their own purposes.

A police spokeswoman referred questions to Consumer and Business Services which declined requests for an interview.

But a statement from Liquor and Gambling Commissioner Dini Soulio said "the measures were developed and adopted by local licensees within the Port Augusta area".

"Consumer and Business Services is analysing general data to consider what further policy decisions may be taken to minimise the impact of alcohol-related harm within the community.

"Should any further policy measures be proposed, licensees, service providers and the community will be consulted before they are implemented," Mr Soulio said.

Ian's Western Hotel proprietor, Mark Davies, declined to comment, and referred questions to the Australian Hotels Association.

The Australian Hotels Association and the Australian Liquor Stores Association have been contacted for comment.