A team of 10 lawyers are representing Gachagua in the case in which he faces six counts, including conspiracy to commit an offence of corruption, fraudulent acquisition of property and money laundering.
Rigathi was arrested on Friday and spent the weekend in the cells.
He was picked up by DCI officers in the morning and driven to Nairobi.
His lawyers are Kioko Kilukumi, Alice Wahome, GladysSholei, Kipchumba Murkomen, Sylvanus Osoro, Irungu Kangata, Gibson Kimani, Wyclife Nyabuto, Amos Kisiwi and Paul Gacheru.
Kilukumi is leading the defence team.
Rigathi is accused alongside 10 others.
They are William Mwangi, Anne Ruo, Julianne Makaa, Samuel Ireri, Grace Kariuki, Lawrence Kimaru, Irene Ndigiriri, David Nguru and M/S Rapid Medical Supplies Ltd.