If it is not handled properly, it can be contaminated. Let's say a police officer sweats on a piece of an evidence; (it is) contaminated. You have to use rubber gloves, you cannot keep it in high temperatures, it has to be cool and dry. |
In O.J., the defense raised the questions that the evidence was kept in the trunk of the car, collected without officers using gloves, et cetera. |
There have always been questions about reliability (of) other types of evidence -- eyewitness testimony or circumstantial evidence. Once they see the DNA evidence, there's no question. You are either guilty or not guilty. |