Even though DNA is so revolutionary and has aided in the prosecution of countless criminals, it hasn’t gone unnoticed by critics. In fact, it’s because of its high success rate that many defense attorneys attack it whenever the test results are unfavorable to their cases. Others believe that DNA tests don’t account for differences in ethnicity; whereas one ethnic group may have a higher probability of sequence matches than another group--in short, not much is known about how DNA is sequenced amongst the different races. People are also concerned about incorrect handling of evidence by police; a prime example of this was seen in the O.J. Simpson criminal trial. If the evidence to be genetically tested isn’t handled with extreme care, the DNA could be damaged, producing faulty test results. Still, though, DNA tests are undeniably the best forensic evidence available.