Police sought ten days to detain Migori governor Okoth Obado who is facing the charge of possessing guns illegally.
The governor was arraigned at the Kibera law court a day after he was arrested for allegedly keeping eight guns in his house.
There was tight security as Obado was ushered into an empty courtroom. The doors were shut.
He was accompanied by his lawyer Cliff Ombeta even as journalists struggled to get pictures of him.
Obado was interrogated at the Directorate of Criminal Investigations headquarters for a better part of Wednesday.
The guns were reportedly found when EACC detectives raided the governor's Nairobi and Migori homes as well as offices on Tuesday.
The DCI earlier said the weapons would be subjected to ballistic examination and verification.
The probe is to establish whether the guns were licensed to be owned by the governor.
Obado is also facing a murder charge of Rongo University student Sharon Otieno.
He faces probe on accusations of embezzling Sh2.5 billion county funds through his proxies.