Former nominated senator Gloria Orwoba briefly spent part of the Wednesday night at the Central police cells in Nairobi after her arrest from outside the Parliament Building.
She was later released on Sh10,000 cash bail pending arraignment.
Police said they were preparing charges of creating disturbances and obstruction of justice.
After her arrest, she was taken to Central Police Station where she was processed.
Nairobi police boss George Seda said the investigation team had released her pending possible arraignment.
“She was released on Wednesday evening on goodwill pending possibility of being arraigned with obstruction to justice and creating disturbances. We will proceed with the case,” he said.
He added she left the station with no complaints.
Orwoba had complained of being held at the station without a word.
“I have been detained in the Central Police Station.
I am awaiting my charges which are apparently being booked at parliament police station.
The central police bosses say that they cannot charge me because the individual who triggered the arrest are not here and they are the ones to charge me,” she said in a post on her social media.
She had been barred from accessing the precincts in a dramatic incident.
She said the move is shrouded by corruption.
“I want to assure those doubting my intentions and my reasons for fighting.
This is not about a salary or a position, trust me.
By the time this fight comes to an end, the outright corruption and impunity will lay bare for EVERYONE to see.
From the Senate Speaker’s office to the Clerk of the Senate all the way down to their errand boys and girls.”
“So, don’t be distracted by those trying to make this about the salary or privileges.
There is a bigger war here.
They will try to use shame to silence me, but they must remember I am shameless!” she said.