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.

You can have a 16-inch trunk go through the windshield.

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.

It was a huge, huge explosion. We have collected all the available evidence from the scene and we're are working on that.

It's stuff I've collected or purchased at auctions,