The government has described reports that an outlaw gang member "attempted to take an interest" in a since-suspended company contracted to work on the project. In a statement, Mr Malinauskas said he had written to ICAC Commissioner Emma Townsend, requesting an independent evaluation of integrity safeguards.
"There is no evidence before the state government that organised crime has gained access to the Torrens to Darlington project," the Premier said. He characterised the referral as a precautionary measure to ensure taxpayer funds do not end up in the hands of organised crime.
Opposition spokesperson Ben Hood last week raised concerns about the possible involvement of bikie gangs, warning that South Australia "can't afford" to have its major projects hijacked.
Infrastructure and Transport Minister Joe Szakacs reiterated the government's zero tolerance for criminal behaviour, stating that the state's track record has set it apart from other regions. "South Australia has been fortunate not to witness the sort of behaviour on major projects that has been seen on the eastern seaboard," Mr Malinauskas added.
The $15 billion Torrens to Darlington transport corridor upgrade, jointly funded by the state and federal governments, is described as the largest infrastructure project in South Australia's history. It will ultimately be up to ICAC to determine whether it investigates the matter.