Finding a person’s fingerprints at a crime scene is not always enough to convict, as they can claim that they were left before the crime took place. However, this adverse scenario for law enforcement agencies could change, as scientists have now developed a method of time-measurement of fingerprints left at crime scenes.
Professor Young Young Lee of a research team at Iowa State University recently came up with a new theory that as fingerprints age, ozone in the surrounding air reacts with unsaturated triylglycerides deposited at the fingertips. The scientists studied several photos of three volunteers that remained on different surfaces over a seven-day period. Using a technique called mass spectrometry, researchers were able to reliably determine how long the fingerprints remained based on the rate of degradation of triyl-based glycerin.
Also, the whole process of checking does not damage the fingerprint, can be used to accurately identify the individual. In addition, even after powdering with forensic powder, it is still possible to accurately determine the time left behind.
It is worth noting that the degradation rate varies from person to person, possibly due to the different lipid content in its fingerprints. This means that the date cannot be determined unless the police know who it is and determine the person’s unique triylglyceride characteristics.