Earlier witnesses had identified acute VX poisoning as the cause of Kim's death and testified that the nerve agent was found on Kim Jong Nam's body and belongings.
Paolo, the President's eldest son, has been accused as being a member of a Chinese organised crime syndicate and allegedly overseeing a drug-smuggling and drug lord protection scheme.
If convicted, the suspects may be jailed for up to seven years in jail and fine of up to three times the amount pocketed. There will be an additional fine of up to S$10,000 as well.