Describe how to collect and preserve arson evidence.
DefinitionDescription should include
- posting guard(s) at the scene and preventing unauthorized personnel from entering
- boarding doors and windows
- marking, tagging, and photographing all evidence
- logging the names of personnel at the scene
- using special containers for preserving vapors released by charred evidence.
- When and why does the fire department’s authority end at a fire scene?
- Why is it a good idea to record the names of personnel at a fire scene?
- Why would any unauthorized person try to gain entrance to a crime scene?
- What container preserves the head-space vapors?
- What is the absorption-elution method for containing arson evidence?
Related Standards of Learning
The student will investigate and understand that experiments in which variables are measured, analyzed, and evaluated produce observations and verifiable data. Key concepts include
- designated laboratory techniques;
- safe use of chemicals and equipment;
- proper response to emergency situations;
- manipulation of multiple variables, using repeated trials;
- accurate recording, organization, and analysis of data through repeated trials;
- mathematical and procedural error analysis;
- mathematical manipulations including SI units, scientific notation, linear equations, graphing, ratio and proportion, significant digits, and dimensional analysis;
- use of appropriate technology including computers, graphing calculators, and probeware for gathering data, communicating results, and using simulations to model concepts;
- construction and defense of a scientific viewpoint; and
- the use of current applications to reinforce chemistry concepts.
The student will plan and conduct investigations using experimental design and product design processes. Key concepts include
- the components of a system are defined;
- instruments are selected and used to extend observations and measurements;
- information is recorded and presented in an organized format;
- the limitations of the experimental apparatus and design are recognized;
- the limitations of measured quantities are recognized through the appropriate use of significant figures or error ranges;
- models and simulations are used to visualize and explain phenomena, to make predictions from hypotheses, and to interpret data; and
- appropriate technology including computers, graphing calculators, and probeware is used for gathering and analyzing data and communicating results.