Why not a narco test for Jagdeesh Tytler and Sonia Gandhi?

Amidst the demand of a narco test for Narendra Modi by Shankar Singh Waghela, I would like to ask the people why not demand a test for Jagdeesh Tytler in case of m sikh killings in 1984 and Sonia Gandhi to find the facts of her much talked about relations with Quattrochi ? and it should be on a "First in First out" basis.