Scrape evidence is a term used in forensic science to describe the process of collecting physical evidence from a crime scene. This evidence can include fingerprints, fibers, and other trace materials. The term 'SCRAPE' refers to the use of a tool such as a scalpel or razor blade to collect the evidence. The evidence is then placed in an evidence bag and sent to a laboratory for further analysis. The term 'SCAB' is a four-letter word that means a crusty protective layer formed over a wound or sore. In this context, it could refer to the crusty residue left behind after scraping evidence from a crime scene.