Blood evidence from OJ Simpson

Where this investigation lacked communication and where the team did not follow the exhibit log was when Thano Peratis (Nurse employed by the LAPD) drew the blood of OJ Simpson for comparisons to be made. This vile of blood was then given to Phillip Vannatter. Here the lead detective should have placed this into the chain of custody and passed it over to the Forensic Scientists stating what individual the specimen is from, the time date and location of where is was taken, the amount that was taken and whom by. However Vannatter place the vile of blood within his pocket and did not log it in as evidence. With the blood in his pocket he went to the location of the crime scene and never entered the evidence in until he returned many hours later. Because of this Forensic Scientists did not know where it was at the time. The scientists also did not know how much blood was taken and neither did Vannatter. Due to the fact there was no log entry of the blood this led to a heated debate within court and ultimately allowed the defence to argue that some of the blood could have possibly planted hence why it was found at the crime scene. 

Gregory Matheson who was a specialist chemist and one of the lead forensic scientists within the OJ Simpson murder investigation testified that the blood within the bronco could have been the blood drawn from OJ Simpson. Here is a clear example of the detectives not following protocol by entering the evidence into the chain of custody allowing for a smooth prosecution. However as to this testimony and no documentation of the blood upon the collection it allowed the defence to argue this evidence out of court. 

The image above shows Gregory Matheson testifying within court. This image shows the specialist drawing a line as to where the blood should have been and where it was when handed in as evidence hours later prior to the collection.