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