In the spring of 1662, the town of Haddington became the site of a legal proceeding involving Bessie Thomason, whose case emerged during a period of heightened judicial activity. Her inclusion in the court records was precipitated by the testimony of James Welch, a youth whose involvement in the legal system was deemed so significant that, despite his age rendering him unfit to stand trial, his denunciations were formally recorded and treated with gravity by the authorities. While Welch was ultimately held in imprisonment, his confessions served as the catalyst for the investigations into Bessie and a wider group of individuals named during his interrogations.
Bessie was formally processed under the case reference C/EGD/483 on April 17, 1662, subsequently appearing in the trial records categorized as T/LA/1358. Historians distinguish her identity from that of Bessie Thompson, a separate figure appearing in the records under C/EGD/541, ensuring that her specific legal journey is treated as a distinct entry within the wider context of 17th-century Scottish witch trials. The records pertaining to Bessie remain part of the collective archive of the period, documenting how the accusations of a single youth could ripple through a community and necessitate the formal intervention of the Haddington judiciary.