The NCIS team investigates the copycat murder of an unsolved case from 150 years ago that spawned a legendary New Orleans ghost story. Also, Gregorio is spooked when the case is connected to a recent séance and a local medium ghost stories, haunted tours & a séance all wrapped in a murder case.
When Agent Pride is in the grandmother's ransacked house with the victim's sister, she begins to straighten up, standing chairs and pictures up, etc. Pride doesn't stop her or say anything even though forensics/crime scene hasn't been there to take photos yet. He allows her top continue disturbing the crime scene.
Loretta is explaining to Pride that she found unknown bacteria in the victim's lungs. As she is telling him this she walks over to the counter and picks up a yellow-top SST (serum separator tube) and shows him, implying it has something to do with the bacteria she found. This tube is used to collect blood samples, and has nothing to do with bacteria and/or the culturing of bacteria.