I found some information on the Hell Creek dinosaurs.
The scientist who claims to have found tissue in fossils admits that she needs more work to prove this. Critics believe that the fossils were contaminated.
This is where the scientific method works. This person comes up with these findings and it's interesting. But she has a long way to go before her findings are accepted in the scientific community. If what she found really happened she will be able to duplicate her results and other scientists will be able to duplicate the results using her methods. If true, they would have to revise common scientific thought on things. But that hasn't happened yet, it's one person, one experiment.
Meanwhile, in the religious community of evolution deniers, this is passed off as proven science, because it confirms what they want to believe.
Scientists agree on one aspect of Mary Schweitzer's research. The tissues she found shouldn't have been there, at least according to basic concepts of fossilization. Because of this, critics assert that what Schweitzer really found was a contaminated sample, not a breakthrough. Over 65 million years, there's plenty of time for other life forms to contaminate the bones of a dinosaur. Fossils also come into contact with human and other tissues during excavation. This presents a challenge for researchers trying to prove that a cell, tissue sample or DNA strand came from a specificextinct animal.
After Schweitzer's first paper appeared in Science, some critics suggested that she published it before conducting enough analysis. Schweitzer agreed with this claim at least in part. She explained that the team published its findings as step to securing funding for later work [source:Yeoman].