Crime Scene Investigation Basics

Describe the difference between compression marks and scraping marks.Describe the proper method when using sulfur casting on a footwear impression in snow.Describe the two methods for collecting comparison footprints from a suspect.Describe how shotguns differ from other firearms.Beyond determining that two rounds were fired from the same gun, what other information can be developed from firearms-related evidence?Explain unique considerations associated with the documentation, collection and preservation of fire-arms related evidence, in relation to other forms of physical evidence collection.