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Lieutenant General Tommy Mthombeni said after casting their votes, some people would use phones to take pictures of the marked ballot - which is prohibited.
Among those who cast their votes in Soweto was ANC President Cyril Ramaphosa, who cast his vote at the Hitekani Primary School in Chiawelo.
Justice Mokgoro, who was an celebrated member of the Order of the Baobab, died on May 9 at the age of 73 and will buried on Thursday.
District Attorney John Adams says it's worth looking to see if other cases would be eligible for this type of testing.
Investigators recently used Virginia-based BODE Technology to help solve the murder of Cynthia Baver.