We previously wrote about the phenomenon of convictions based on science that is credible at the time of trial, but later comes to be repudiated. Such post-conviction shifts in science were most obvious and reprehensible in the very old cases, the example being a 1986 arson prosecution, whose scientific underpinnings are exposed in a post-conviction motion filed in 2011. Immediately upon completing that article, we came to realize that it told only half the story. We seek in this Article to build on that foundational idea of "shifted science" by discussing at length a harder question: the perception, percolation, and continued evolution of shifts in science. We address here cases that arise on the cusp of a shift, identify the process of the shift in various forensic science disciplines, and analyze how difficult it can be to perceive and address a shift in science, even when it occurs concurrently with, or even some time prior to, trial. Taking a step-by-step route through the process of significant shifts in several different forensic disciplines, we hope to clarify the many stages involved in these shifts and the important consequences of misperceiving shifts in science as they occur. Finally, we also lay a foundation for a later piece addressing the difficult question of legal avenues for relief in shifted science cases that arise on the cusp of a revolution, such as those we address here.

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