Most blood samples collected at crime scenes IS dried. It is easily reconstituted without degrading the cellular evidence it contains.
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.
1 pint is collected
1 unit
The correct term to use is " there was blood evidence found in the room" if more than one source of evidence i found then the correct term is " there was blood and other evidence found in the room."
There is no "probable cause clause" attached to the collection of evidence. EVIDENCE of a crime can be collected at any time law enforcement beomes aware of the offense. Evidence, once collected, is developed and used by the investigators, and can lead to the establishment of "probable cause" to charge a particular individual. Under a more technical view of evidence collection - sometimes a warrant may have to be applied for in order to look for and gather evidence and a judge would have to be persuaded that 'probable cause' existed to enter a premises or take blood samples, etc.
complete blood count
DNA is classified as circumstantial evidence as there are a variety of scenarios in which the DNA could have been there, say at a popular pub there was a murder, a police man finds some blood on the floor which was not that of the victim; this is not conclusive as the blood could have gotten there a variety of ways.Added: In order to be admitted into evidence, as one of the qualifying exceptions of the "circumstantial evidence" rule, supporting facts and/or evidence must bolster its admission. Something more than mere conjecture must be offered in support of the collected DNA.
Deoxygenated blood is not collected anywhere. Blood is a constantly moving stream - it never stops, as the question implies. The oxygen poor blood goes to the lungs, where it turns oxygenated as it takes up oxygen.
platelets
blue
blood.
Blood