case_images: PMC8143886_01
case_images: Questioned documents (A1, A2, and A3) (deidentified with white markers).
case_images: JAMC2021-8870541.001.jpg
case_images: PMC8143886_01_JAMC2021-8870541.001.jpg
case_images: fig1
case_images: All samples were obtained from a court, and the papers under examination were coded as A1, A2, and A3 (Figure 1).