In 1994, forensic botanist Miriam Achebe was called to testify in the trial of a farmhand accused of murdering his employer in rural Ohio — and she brought with her evidence that had never been used in an American courtroom: the growth patterns of weeds. What she found in the dirt didn't just challenge the prosecution's timeline; it unraveled an entirely different story about who was really in that field, and why local law enforcement had been so eager to close the case before the ground thawed.