In October 1981, a Special Task Force (STF) was established by the Intelligence Bureau (IB) to provide transportation security and road escorts for prime minister during travels in and out of New Delhi.

After the assassination of Prime Minister Indira Gandhi by two of her Delhi Police security personnel in October 1984, a review was undertaken by a Committee of Secretaries of the Ministry of Home Affairs.

On 18 February 1985, the Ministry of Home Affairs set up the Birbal Nath Committee to examine the issue and submit recommendations to the government for prime ministerial security.

The Blue Book, an existing manual for the protection of the prime minister, was amended to incorporate new proximate security protocols.

That year, the Rajiv Gandhi Government passed the Special Protection Group Act to codify the order's provisions.

[4] Prior to the end of this period, a security review would be conducted by the IB to determine a protectee's current threat and the need for extensions (which would last five years).

Under the amended legislation, former prime ministers are eligible for an extension of their protection for up to five years after leaving office, subject to a threat assessment by the Intelligence Bureau.

[9] The bill was opposed by the Indian National Congress, fearing that the Gandhi Family would face a greater risk of violence without SPG protection.

Personnel from these services may apply for deputation to the SPG and undergo rigorous physical and psychological assessments as well as enhanced security screening.

Additionally, under terms of the Special Protection Group (Amendment) Act, 2019, SPG security details for Modi's estranged wife, Jashodaben, and mother, Heeraben, were withdrawn that same year.

Additionally, they are exempt from security screening when entering certain official buildings, including the prime minister's office and residence.

The prime minister's motorcade comprises a fleet of vehicles, the core of which consists of at least two Mercedes-Maybach S650 guards/Range Rovers, twelve Toyota Fortuners and a Mercedes-Benz Sprinter ambulance.

These SUVs are armoured by Land Rover's Special Vehicle Operations facility in Coventry, England, and are certified with VR8 in the BRV 2009 ballistics protection ratings.

They can withstand some of the most damaging and targeted of threats, including penetration by 7.62mm high velocity armour piercing incendiary bullets, they can protect occupants against up to 15 kg lateral Trinitrotoluene (TNT) blasts and defend against DM51 grenade explosions from both beneath the floor and above the sunroof.

These SUVs carry the SPG Special Agents and Uniformed Officers assigned to the Prime Ministerial Security Detail.

The antennas mounted on the roof are used in barrage jamming applications and for scouting purposes, the primary method used to counter IED threats.