Have the tests been improved throughout the years?
Scientists are now more precise with identification and determination of biological relationships between a possible parent and child. The DNA profiling is much easier than past techniques such as ABO blood group typing or using human leukocyte antigen antigens. These involve the complexity of identifying antibodies of red blood cells, IgM (Immunoglobulin M), and linking the parent to the child, while DNA profiling simply compares common genes to figure out where each cell is derived from.