Internet Archive (Full PDF) : Another digital copy of the classic Modi text.
National Library of Medicine : Digital collection of the classic 1902 text. A Textbook of Medical Jurisprudence and Toxicology
Internet Archive (13th Edition) : A widely cited version published in 1961. Internet Archive (Full PDF) : Another digital copy
For modern, updated editions (such as the 27th or 28th editions of Modi), full text is typically restricted to paid platforms: A Textbook of Medical Jurisprudence and Toxicology
If you tell me you are looking for, I can find a more direct link for you.
University of Glasgow / Internet Archive : Full electronic resource of this authoritative work.