The author is very optimistic and uses “science” inferences to  this type of pattern observation method. He does talk a bit about standardizing terminology which is a good thing. The bad thing is he confuses multi-agreement among tested BPA examiners as a form of validation. This is not accurate, unfortunately.

http://www.barristermagazine.com/blood-pattern-analysis-is-it-worth-the-paper-its-spattered-on/