Guingon, Jhon Cleoferd C.
3rd year Bs Criminology
forensic 3
1.)
2.)The examination of the serial number of engine and chassis of a motor vehicle by a
crime laboratory Technician by means of applying chemicals solution on the said serial
numbers to determine whether there is tampering and or possible restoration of the
tampered serial numbers.
3.)The most common reagent formacroetchingiron and steel is a 1:1 mixture, by
volume, of concentrate hydrochloric acid and water. Other reagents
included:sulphuricacid, ammonium persulfate, and nitric acid.
4.)The examination of the serial number of engine and chassis of a motor vehicle by a
crime laboratory Technician by means of applying chemicals solution on the said serial
numbers to determine whether there is tampering and or possible restoration of the
tampered serial numbers.
5.)Tool-mark analyses help forensic scientists identify the tool or tools used at the scene
of the crime and link the tool(s) to the criminal. Investigators compare marks by
examining detailed photos or silicone casts of the marks and collect trace evidence (such
as residue) left behind by the tool.
6.)Define the following
a. Tool marks-A tool mark is any impression, scratch, or abrasion made when contact
occurs between a tool and an object.i. Tool marks can be linked to tools used at a crime
scene, and ultimately may be used to help find the suspect who used it.
b. Macro etching-is a procedure for revealing the large-scale structure of a metallic
specimen, that is, structure visible with the unaided eye, by etching an appropriately
prepared surface. The procedure is used in process metallurgy as both a quality-control
tool and an investigatory tool.
c. Impressions-There are also three categories of prints that can be gathered from a
crime scene: patent, plastic, and latent. A patent print is what's left when you have liquid
on your fingers—ink or blood, for example—and touch a smooth surface. It's visible to
the naked eye.
7.)To determine whether or not the serial numbers of Motor Vehicles or Firearms are
tampered. To restore the original serial number of an article in questioned.
