This article discusses the evolution, current trends, limitations and controversies around the understanding and practice of human rights due diligence (HRDD), a concept developed in the course of the work of United Nations (UN)-mandate holder, John Ruggie, and enshrined in the UN Guiding Principles on Business and Human Rights. While the concept has gathered broad acceptance and a growing number of legislative proposals are seeking to entrench it in law, significant differences of opinion exist among stakeholders as to its nature, objectives and relationship, if any, with legal liability. These differing understandings are at play in a contest to shape future legislation. Some of these carry significant risks for rights-holders, notably the risk of outcome being superseded by process and superficial, compliance-oriented HRDD prevailing in the law or in its interpretation and practice. As legislative efforts continue, the authors warn against the risk of hollow laws which do little to change the status quo or, even worse, inadvertently provide a tool to further impunity for business-related human rights abuses.