"Blood Drops" is probably one of the most memorable episodes of "CSI". It is one of the few episodes that focuses only on one case and that case is quite dark and shocking.
The episode opens with a teenage girl named Tina stumbling out of her house and screaming for help. Her family has been brutally stabbed and she and her sister are the only survivors. The scene is so grisly that several police officers get sick from being on the scene.
Several neighborhood boys are questioned after certain clues are found, and one boy, Jesse, admits to the murders but a lie detector test shows he's lying about certain details.
It's discovered that the father had been sexually abusing the youngest girl (played by a young Dakota Fanning) and that Tina had her boyfriend kill her entire family, for letting it happen. Tina herself was sexually abused from a young age and her sister is actually her daughter.
Catherine is slapped with an investigation from child services when her ex-husband files a report claiming she is a neglectful parent.
This has got to be one of my favorite episodes. It's dark, disturbing, and twisted, with elements of dark humor. It's sad and heartbreaking and the very young Dakota Fanning is great and chilling despite having only one or two spoken lines.