Analysis
The Liberal government under Trudeau took *measurable* steps to fulfill this promise, including reinstating the mandatory long-form census (2016), lifting muzzles on federal scientists, and creating the Chief Science Advisor role (2017). However, high-profile controversies—such as the **Trans Mountain pipeline approval** (despite climate science warnings) and the **SNC-Lavalin scandal** (alleged political interference in prosecutions)—undermine the claim that *all* decisions are science-driven. Independent analyses (e.g., *Evidence for Democracy*) note progress but highlight persistent gaps in transparency and consistency. The promise was thus *partially* kept, with politics still influencing outcomes in contentious areas.
Background
Trudeau’s 2015 campaign criticized the Harper government for allegedly sidelining science, pointing to cuts to research programs, muzzling scientists, and dismantling the long-form census. The pledge resonated with voters concerned about erosion of evidence-based governance. However, governing often requires balancing scientific advice with economic, political, or diplomatic pressures—a reality that has led to accusations of hypocrisy.
Verdict summary
Trudeau’s 2015 pledge to prioritize science in policymaking saw *some* implementation—like restoring the long-form census and appointing a Chief Science Advisor—but critics argue political considerations still often override evidence in key decisions (e.g., Trans Mountain pipeline, SNC-Lavalin affair).