In August 2016, he stated that the law allowed jailing a man for staring annoyingly at a woman for 14 seconds.

He took charge as joint director CBI’s ACB Central Zone, Bhopal in January 2013. He was posted to Thiruvananthapuram as transport commissioner on June. Under his administration accident rates declined considerably. He later became Excise Commissioner, Kerala.

At NIA, Singh was awarded the Presidents Medal for Distinguished Services in 2009.

Singh was appointed to the IPS in 1985 and is a part of the Kerala cadre. He started his career as an ASP in Kerala and served as DCP in Kochi and Commissioner of Police in Thiruvananthapuram. He was appointed SP and later DIG in the Central Bureau of Investigation. He was involved in the investigation of cases such as the Graham Staines murder case, Purulia arms drop case and Mumbai serial blast case. In 2009, he joined the National Investigation Agency (NIA) as a founding member. At NIA, he headed the Terror Financing and Fake Currency specialized cell. Prior to his appointment as DGP of Kerala, he served as Director, Kerala Fire and Rescue Services. He was a part of the team that traveled to the United States to question David Headley in 2010.

Rishiraj Singh (born 23 July 1961) is an officer of the 1985 Indian Police Service (IPS) Kerala cadre.