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During the COVID‐19 pandemic, the United States released the CDC‐issued vaccination card to document the status of immunizations. It eventually was used as a verification system to allow patrons to safely access public venues. This is/was apparently a simple printed piece of paper with minimal security features which made it an easy target for counterfeiters with little expertise required. Those unvaccinated...
Determining specific line‐crossing sequences has always posed a challenge for document examiners. Interactions between pen ink and stamp seal ink can be complicated and changeable due to the many seals and writing inks available in the market. This study determines the line‐crossing sequence of stamping before writing by observing the influence of seal ink on pen writing. The results of examining...
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