According to Macklin & Natanson (2019), one reason unusual practices can be misidentified as usual care is that “instead of using pertinent, accurate information describing usual care, investigators may rely on the opinion of ‘experts’ in the field, whose information may be out of date or otherwise inaccurate." We find Macklin & Natanson’s insights about misattributed expertise crucial, and suggest their discussion can be elucidated further by characterizing it in the context of Ballantyne (2018)’s recent exploration of what he calls (...) epistemic trespassing. What insights can be drawn from this characterization? In this commentary, we highlight two. First, the characterization elucidates the serious consequences that can result from epistemic trespassing. Second, the characterization of Macklin & Natanson’s cases as instances of epistemic trespassing offers us a potential roadmap for overcoming some of the problems the authors identify. (shrink)