I need help from forensic scientists who know about trace evidence?

How long can fibre stay in environment without changing?



How far can trace evidence travel?



How much does the pH vary from soil to soil? Is it possible to say where the soil came from? How?



How significant is the change in pH in soil?



What factors change pH in soil?



What is the reliability of pollen analysis?





Please explain your answers!I need help from forensic scientists who know about trace evidence?
Depends on fibre, temperature, water, ultraviolet light. Example: 1) paper, damp, warm Decayed by fungus. 2) Nylon, dry, dark, cool, maybe millions of years. 3) Glass fibre: vey high permanence.



Trace evidence can be carried by a criminal as fast and as far as they go.



pH range is 0 to 14. Bogs can ahve a low pH e.g. 3. A high pH might be 9. pH tells us very little about soil. Pollen analysis, and isotopic analysis could help with soil characterisation.



pH change could be relevant if e.g. body fluids entered the soil. Recent urine could make soil very smelly (ammonia) and alkaline.



Presence of limestone, marble, humus.



Pollen analysis: excellent, I think.