Migori Governor Okoth Obado will spend another night in police cells following his arrest over possession of items including eight firearms.
Mr Obado was arrested on Wednesday after officers of the Ethics and Anti-Corruption Commission (EACC) raided his homes and office. His lawyers said he spent the night at Gigiri Police Station.
Kibera Chief Magistrate Joyce Gandani made the ruling on Thursday, when the governor appeared before her.
Ms Gandani said the governor will spend the second night at Gigiri and return to court on Friday for a ruling on his release.
The prosecution wants Mr Obado held for 15 days for proper investigations into the case.