Rab yesterday requested the Criminal Investigation Department to sue suspended health directorate driver Abdul Malek for money laundering.
Besides, Rab will take over the charge of investigation of the two cases filed against Malek, who has raked in over Tk 100 crore.
He is accused of being involved in a syndicate that used to manipulate recruitments, transfers and promotions of third and fourth class employees of The Directorate General of Health Services (DGHS).
Malek also faces allegations of trading in counterfeit currencies.
Sources said many others suspected of being involved in the racket are being watched by the law enforcers.
Malek not only manipulated the recruitments and promotions of DGHS employees but also used his connections to get his daughter, son-in-law, brother and nephew recruited at the DGHS, the sources added.
Sources said Malek even influenced the promotions and transfers of doctors.
Malek joined the DGHS as a driver of a project in 1982 and his job was confirmed four years later. He worked as the driver of director-general of DGHS until January 1 this year when he was transferred to the directorate of health education.
Rab arrested Malek on Sunday at his Dakkhin Kamarpara residence in the capital and seized a firearm, a magazine, five bullets, and Tk 1.5 lakh in fake notes. He was then handed over to Turag police and two cases were filed against him for illegally possessing arms, ammunition and fake notes.
Malek is now on a 14-day remand in the two cases being investigated by Turag police.
Rab yesterday also wrote to the home ministry to take over the charges of investigation of the two cases, said Lt Col Ashik Billah, Director Legal and Media wing of Rab.
"We have also written to the CID, requesting them to file a money laundering case against Malek," he told The Daily Star.
Malek is the owner of two seven-storey buildings in Dakkhin Kamarpara area of Turag. There are 24 flats in the buildings named after his first wife Nargis Akhtar. He used to live on the second floor of one of the buildings.
Malek also owns several plots in different parts of the capital. A building is being constructed on a four-and-a-half katha land in Dhanmondi. He has a dairy farm on a 15-katha land in Dakkhin Kamarpara.
Meanwhile, the director (administration) at the Directorate General of Health Education in a statement yesterday said since the inception of the directorate on November 24 last year, no recruitment, procurement, postings or promotion have taken place.
There is no link between the illegal activities of Malek and the DGHE or its Director General AHM Enayet Hossain, it added.
So, the allegations against him are his own responsibility, it said.