You will have to either be more specific about what you want to find out, or narrow your subject field down a little. There are entire textbooks written on this subject and which contain more material than can possibly be covered here.
evidence
In certain cases in could but in a general term no it cannot, poorly collected evidence could contaminate it or even if obtained wrong could be thrown out and not be used as evidence that is why there are procedures to be followed.
Variables
a questioned specimen is evidence collected at the scene of the crime and a known specimen is something from a known person or source.
Empirical research is a way of gaining knowledge by means of direct observation or experience. Empirical evidence (the record of one's direct observations or experiences) can be analyzed quantitatively or qualitatively. Through quantifying the evidence or making sense of it in qualitative form, a researcher can answer empirical questions, which should be clearly defined and answerable with the evidence collected. Research design varies by field and by the question being investigated.Empirical evidence is gained by direct or indirect observation and experience.
Where is Physical Evidence found and collected?
The hubble law was collected by cameras
evidence
an evidence would be inside of the house like how to fire started
They cannot retry! Evidence is sometimes wrong!Added: If evidence is not completely, properly and thoroughly collected or processed, and documented it is subject to being challenged by the defense which might throw its reliability into question.
In certain cases in could but in a general term no it cannot, poorly collected evidence could contaminate it or even if obtained wrong could be thrown out and not be used as evidence that is why there are procedures to be followed.
Most blood samples collected at crime scenes IS dried. It is easily reconstituted without degrading the cellular evidence it contains.
Potato !
Variables
Too broad a question to answer here. It all depends on the type(s) of evidence being collected and the conditions to which it has been exposed.
Variables
It is called "processing"