Pistorius Lead Investigator Testifies About Mishandled Evidence

Schoombie van Rensburg told a South African court about big mistakes made at the crime scene.
3:00 | 03/14/14

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Transcript for Pistorius Lead Investigator Testifies About Mishandled Evidence
Monday. Right to the latest in the Oscar Pistorius trial. ABC's Matt Gutman right there at the courthouse in Pretoria, South Africa. Good morning, Matt. Reporter: Hey, good morning, George. It was mostly blood and police plungeling this morning. I was sitting there in court and suddenly jaws dropped, the lead police investigator started walking us through multiple police mishandling of evidence and he said it started when they began stomping all over that bloody scene. Minutes after Oscar Pistorius shot dead his lover on Valentine's day last year, the officer in charge of the scene recounting walking up the stairs to witness one of his officers handling Pistorius' gun barehanded. The expert was having the firearm in his hand without gloves and then he said sorry and put th magazine back. Reporter: He then said the cop reinserted the ammunition clip and casually placed it back on the bloody towel. It gets worse. Look at that blood smeared watch of luxury watches. The colonel admitting to the disappearance of a watch valued at $5,000 nearly the salary of a police officer's here. We body searched everyone. Reporter: But Pistorius' watch has never been found, one of a multitude of allegations of police corruption and bungling. Including that door through which Pistorius shot his model girlfriend reeva steenkamp, police admitting pieces of it went missing and that colonel van presence berg kept it in a body bag in his office for weeks. In the U.S. This would be grounds for dismissal. He already admitted he shot reeva steenkamp. It's unlikely that the judge would even consider a case for dismissal which would only be brought once the state closed its case. Reporter: We see Oscar Pistorius as he looked that night posing in crime scene photos in blood-soaked shorts and socks. The colonel pointing to this open window noting a break-in at the second floor window and that secure development would be unlikely. We drove to that development. High walls, electric fences and friendly but firm guards. We just want to take a look inside. We're not armed. Just want to drive around for a little bit. Is that okay? Now, we may never know what exactly happened inside that gated community but this we know. The defense has been pounding that police witness, essentially putting him on trial and just now suggesting that all of the evidence may be contaminated. Lara. All right, Matt, on and on it goes. Right to ABC news chief legal affairs expert Dan Abrams and, Dan, the big headline out of the courtroom today is how badly the police bungled the crime scene including the weapon, the gun. Is this a big break for the defense? Yeah, sure, this is a big deal are to the defense when you can say that one of the first officers arriving on the scene is starting to manipulate the murder weapon as soon as he gets there and one of his supervisors has to say, in effect, what are you doing? There's a watch missing. This has been a consistent theme throughout this case, which the defense saying you can't trust the evidence but this is a different kind of case because this case is not about who did it. Yes. But why he did it. Some of this becomes a little less important than it might be in another type of case. And I know a lot of pictures were introduced by the prosecution but you say of the crime scene you're saying that some of them could actually end up helping Oscar Pistorius. Some of them back up his account of what happened. Remember, one of the key points is he says he was up in the middle of the night taking a fan off the balcony when he hears noises in the bathroom. That's when he runs in. Well, there's a picture of that fan in a place that kind of makes sense if you were putting it off the balcony where would it be? They found, for example, the bathroom key in the lock as he had suggested it was. Just little things that he said in his application for bail that are now being supported by the pictures that have been introduced so certainly cuts both ways.

This transcript has been automatically generated and may not be 100% accurate.

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