The detention of constitutional court chief judge Akil Mochtar on Wednesday followed the arrest of the country's top energy regulator in August and a string of corruption cases linked to President Susilo Bambang Yudhoyono's ruling Democratic Party.
"During the search of Akil's office, investigators found items suspected to be illegal drugs," Corruption Eradication Commission (KPK) spokesman Johan Budi said at a press conference on Friday.
An unnamed source at the KPK said investigators found marijuana, but the amount was unclear.