Closing arguments in the murder case against musician Molemo "Jub-Jub" Maarohanye and his co-accused Themba Tshabalala will continue in the Protea Magistrate's Court on Tuesday
The two also face charges of attempted murder and driving under the influence of alcohol and drugs.
They were allegedly racing their Mini Coopers in March 2010 when they crashed into a group of schoolchildren in Mdlalose Street, Protea North. Four boys died and two others were seriously injured.
The State argued that Maarohanye's testimony could not be taken seriously and that he had exposed himself as an unreliable witness.
It also argued that Maarohanye and Tshabalala had not shown concern for the schoolchildren after of the accident.
On Monday, Maarohanye's lawyer Ike Motloung submitted that his client's rights had been breached at the scene of the accident.
He also criticised the State's witnesses and said evidence by forensic analyst Jose van Rooyen could not be relied on.
Van Rooyen testified that drugs had been found in Maarohanye's urine sample.