But tissue is made of cells. The talking heads can be saying "tissue" when in fact it's merely a single skin cell or two resulting from casual transfer. If the similarity between the evidence at the exemplar isn't within the guideline to be deemed a "match", it would be prejudicial of the judge to allow it in. Of course, selling it to the GJ as a "match" is a much simpler matter, and isn't regulated by the court. It's only regulated by the ethical standards of the prosecutor, Since the prosecutor has no ethical standards, rest assured that the test results, no matter how weak, will be spun as a "match" by Nifong to the GJ.