CJ386-Unit 4 Review Fingerprints are a means of personal identification No two fingerprints have ever found to be identical Class characteristics-basic fingerprint patterns (loops, whorls, arches) Individual characteristics (Level II details- bufurcation, ending ridge, dot and level III details- ridgeosopy and poroscopy) Fingerprints develop during fetal development Fingerprints provide us the ability to grip to eliminate slippage while grasping objects A 1:1 photograph with scale should always be taken of a developed fingerprint

Unit 6–Chapter 15 Seminar Questions What is produced in a gun barrel when the barrel undergoes a process known as rifling? What is the purpose of rifling gun barrels? What does the caliber of a firearm denote?

Unit 6- chapter 15 Questions Are the markings or striations on bullets fired from each pistol or rife with rifled barrels unique to that particular weapon? Are their any rifles that do not contain rifling characteristics? What type of rifle has a smooth bore barrel?

Unit 6-chapter 15 Questions What is the difference between a cartridge, a cartridge case and a bullet? What instrument is used to examine and compare bullets or cartridge cases? What is IBIS and how can it help solve firearms related crimes?

Unit 6 chapter 15 Questions How does the firearms examiner test fire a weapon to obtain bullet and/or cartridge case standards? In gunshot residue analysis, what is a primer and what does it contain? What methods are used in the crime lab to identify gunshot primer residue (GSR) from hands?

Unit 6 chapter 15 Questions When collecting bullets and cartridge cases, where should you mark the evidence? See pages Briefly describe the procedures that must be followed to obtain good quality photographs of footwear impressions. Name some other types of impression evidence.

Unit 6-Review Grooves are rifled into the bore of firearms to impart spin and accuracy Fired bullets and discharged cartridge cases are compare using the comparison microscope Identifying characteristics are imparted onto cartridge cases by the breechblock, firing pin, extractor and ejector mechanism Gunpowder patterns can be detected by the Greiss chemical test and by infrared photography GSR is generally not collected from the hands of suspects more than 6 hours after a shooting incident