How the notice/summons/nbw comes from police?

Through police man. The Jurisprudence surrounding issuing of Non-Bailable Warrants

The law for issuance of warrants has been laid down in The Code of Criminal Procudure, 1973 under Chapter VI (part b) from sections 70 to 81.

The issuance of non-bailable warrants involves interference with personal liberty. Arrest and imprisonment means deprivation of the most precious right of an individual.[1] Therefore, the courts have to be extremely careful before issuing non-bailable warrants. Only when in the larger interest of the Public and the State it becomes absolutely imperative to curtail freedom of an individual for a certain period, should non-bailable warrants be issued.[2] Just as liberty is precious for an individual so is the interest of the society in maintaining law and order. Both are extremely important for the survival of a civilized society. Sometimes in the larger interest of the Public and the State it becomes absolutely imperative to curtail freedom of an individual for a certain period.