What steps must scientists follow in order to read a sequence of dna

The use of dna as evidence in criminal investigations became possible because of the

How are tumors cells different from normal cells

Prior to the development of dna fingerprinting, blood type could be used to determine possible parentage. although it might prove someone was not a parent, it could not show if someone was positively the parent, only that he or she might be a parent. which of the following is a true statement that can be made about parentage based on blood typing?