Without the microscope, there would be no forensic science. At least it would look nothing like it does today. When father and son Dutch lens makers Zaccharias and Hans Janssen discovered that lining up several of their spectacle lenses in a hollow tube would magnify any object viewed, they could never have imagined how their discovery would change the world. When Anton van Leeuwenhoek, the Father of Microscopy, perfected this design and incorporated it into his studies of biology and medicine, he too never imagined the invisible world he would enter. Science and medicine would never be the same and the gateway to modern forensic science was opened.
The forensic science disciplines of blood analysis, firearm comparisons, trace evidence (hair, fiber, paint, etc.) examination, took mark interpretation, and even document examination regularly employ various types of microscopy. HERE are some examples.