Businessman and police informant, Tumelo Nku, has returned to the Madlanga Commission to continue his contradictory testimony.

Businessman and IT consultant Tumelo Nku is expected to return to the witness stand with tough questions awaiting him over an unexplained R65,000 in cash as proceedings linked to the July 2021 Aeroton cocaine bust continue.

Nku, who maintained he acted as a confidential intelligence source, is expected to continue explaining the origin of the cash and how it was spent.

His testimony comes as prosecutors continue to challenge his version of events in one of South Africa's most high-profile organised crime cases.

Evidence suggested Nku was not acting as a whistleblower but was instead closely involved in the operation surrounding the 715kg cocaine shipment, valued at about R300 million.