Cracking a hit-and-run whodunit with lasers and pump-probe microscopy

But the culprit had left no note, no phone number, and no insurance information. The timing of the accident, the location of the scratch, and the color of the foreign paint all pointed to a likely suspect: another vehicle in her apartment complex parking lot, also sporting a fresh gash. She had a solid lead, but Yu wasn't quite satisfied--she turned to her training in scientific research using pump-probe microscopy.