2How can paint tell a story?? Able to associate an individual or vehicle with a crime sceneHit and Run cases—dried paint/paint smears transfers to clothing or vehicle upon impactBurglaries—paint can be transferred onto tools used to break into thingsCan identify color, year, make, model of a car by paint recovered at an accidentThe vehicle involved in a hit-and-run of a bicyclist who later died left white paint chips at the scene.
3CompositionPaint is composed of a binder, pigments, and different additivesMost paint is applied in layers
4Paint Layers on Vehicles Electrocoat primer—applied to steel body of car, provides corrosion resistance, pigmented gray-blackPrimer Surfacer—smooths out and hides seams or imperfections (different pigments)Basecoat—color coat; different additives add different effects (pearl luster, metallic look)Clear coat—unpigmented layer, improves gloss, durability, and appearance
5How do we examine paint?? Microscope Compare questioned sample with control (known) sample side by sideDetermine type of paint,Look at surface texture, color, and color layer sequenceLayers—each layer of recovered sample is compared with corresponding layer of the control sample
6Paint chip left at a crime scene can be compared. Forensic scientist using a microscope to compare paint chips from a car involved in an accident with known samples of paintPicture of paint comparison from hit and runCollecting paint evidence
7Malcolm Fairley “The Fox” 1970s British Serial rapistDetectives found yellow paint specks on a tree at one of the crime scenesPaint analyzed—comes from a Austin Allegro carNarrowed suspects—detective drove up at Malcolm’s house, found him cleaning a yellow AllegroExamined car—found scratches on paint that matched paint flakes to the crime sceneUsing this and other pieces of evidence, Malcolm was tried, convicted and sentence to 6 life sentences for rape, assault, and burglary
8Gary Ridgeway “Green River Killer” 1970s and 80s—truck painter who killed in Seattle areaKilled between women and dumped in Green RiverGary was suspected but never arrestedKilling stop and case goes cold2001—case is reanalyzed; paint on victims clothing matched to highly specialized paint used at Kenworth truck plant where Gary worked2002—using paint analysis as well as DNA analysis Gary is found convicted of 48 counts of murder and was sentenced to 48 life sentences