He would be lodged in the prison till May 17, official sources said.
Kumar, then IGP (West Zone) here, was arrested in New Delhi on May 2 on the charge of entering into a conspiracy to get a bribe of Rs 10 crore from Paazee Forex Trading company for protecting its directors facing charges of duping depositors to the tune of Rs 826 crore in 2009.
A 1989 batch officer, Kumar was later produced before a court here which had remanded him in CBI custody.
As the custody period ended this evening, he was produced before judge, V Ramaswamy, who instructed authorities to lodge him in the Central Prison here.
Ramasamy adjourned the hearing of the bail petition moved by Kumar for tomorrow.
The judge rejected the officer's plea to shift Kumar to Puzhal Jail in Chennai instead of Coimbatore Jail, following "some threat".
The CBI has charged Kumar with abusing his official position and making his subordinates and accomplices extort money from Paazee Group of companies to safeguard its directors.
Kumar was on the run for a long time. The Madras High Court had turned down his anticipatory bail plea last month.
The officer was taken to Coimbatore Medical College Hospital earlier in the day, as he complained of "indisposition". After a checkup, CBI continued questioning him.
