Forensics and the Scientific Method

Scientific Method: Observe a problem or questioned evidence and collect objective data. Consider a hypothesis based on the observation - this requires inductive reasoning, experience, and imagination Test to support or refute the hypothesis. Use deductive reasoning to determine the significance of the evidence

5. Evaluate and verify all evidence - this step is critical, a person’s life may depend on it. Consider standardization reproducibility validity reliability accuracy

The forensic scientist must: Develop a theory or opinion that is able to stand up to scientific and legal scrutiny.

The Locard Principle: Whenever two objects come into contact, there is always a transfer of material. The methods of detection may not be sensitive enough to demonstrate this. The decay rate may be so rapid that all evidence of the transfer has vanished.