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  • Chemical indicator: a chemical that changes color showing the presence of some unknown material
  • Crystal: a natural formation of a chemical. This could be a small cube like an individual piece of sugar or salt
  • Poison: a substance that can injure or kill a living thing
  • Toxicology: the study of substances and their effects on living things
  • Toxicologist: a scientist that studies substances and their effect on living thing
  • Toxin: a poisonous substance that is a specific product of the metabolic activities of a living organism
  • Trace evidence: any small amount of hair, skin, fabric or any other material that may link a suspect to a crime scene