E. Mechanical receptors are located in the lungs, upper airways, chest wall, and diaphragm which prevent overdistension of the lungs. F. Respiratory defense mechanisms: 1. filtration of air by the upper airways 2. mucociliary clearance system -which is decreased by infection, atropine, alcohol, dehydration,
However, one. of the most challenging aspects of forensic DNA analysis is the. interpretation of low-level testing results where it is difï¬cult to. distinguish reliably between noise and signal from template DNA. that is associated with an evidence sample (3,4).
1. STR DNA increased sensitivity in testing. 2. STR DNA increased awareness in evidence handling. - As a result, the crime scene investigator must take great precautions to avoid. the contamination of DNA evidence. In the past, all crime scenes needed to be protected against elements such as: Weather, Animals,