So What Did Margie Say About...CSI Dead of the Class

The blood evidence in the 3/20/13 CSI: Crime Scene Investigation episode titled "Dead of the Class" served as a road map for their investigation.

 

The bloody soap bubbles led the Assistant Medical Examiner to the victim.  I wonder though why when these soapy bubbles popped upon landing on miscellaneous surfaces that there wasn't more spatter associated with this 'popping' action.   I also find it difficult to believe that the technicians would swab and sample every stain created by these bloody bubbles.  If it is relatively certain that it is a single source of blood was contributing to these stains, then a sample from the soap container and a 'representative' sample of the many bubble stains throughout the scene should be sufficient.  The cost and time that it would take to collect and analyze all of the stains would be counter productive.

 

The partial hand print or transfer pattern on the back of the shirt causes me to wonder why someone so obsessed with their looks would not tend to a simply tend to a wound on the palm of their hand rather than letting it bleed to the point that it flows down to cover two fingers and a majority of the palm.

 

The condition of the blood on the knife found in the dumpster alerted the technicians that something was out of the ordinary.  This helped to tie together the use of liquid Nitrogen later in the story line.

 

Blood is not only a great source for DNA analysis and bloodstain pattern analysis but the small investigative leads that it can supply are also important.