improvements of the analyses. One of the benefits of incorporating the LDI MS-based forensic experiments focused on forged document analysis in the undergraduate laboratory is that it allows the material to be explored at multiple levels and with a significant degree of flexibility. For example, students in the lower-level analytical laboratories may focus on the analysis of pen inks, where complete identification of the dyes is possible based on the mass measurement alone. Above and beyond the mass measurements and their use in organic molecule identification, these experiments provide a perfect opportunity to explore the concept of isotopes, and the use of isotopic distributions in chemical analysis.