Rathore's nod to the undergo narco test comes as he replied to a notice issue to him by the Haryana government.
In his letter to Haryana government, Rathore said, "I consider it my moral duty to offer myself for narco tests provided Ruchika Girhotra's family must also undergo a narco test."
"I will also request the government to reach the truth into various kinds of allegations being made against me through the media," Rathore wrote.
Anand Prakash, the father of Ruchika's friend Aradhana, has said before that he was ready for any test if investigation needed so.
Last Dec 2009, Rathore was convicted and sentenced to six-month jail term for molesting Ruchika, a budding tennis player, who committed suicide three years after the incident.
The case comes up for hearing in the session court in Mar 10.