"CSI" caused quite the stir for dramatic crime procedurals with a strong focus on uncovering evidence from a scientific perspective. I've lost count of the spin-offs it spawned. My collection of the various seasons has been sporatic - a season on sale here and there sometimes leaving me unwilling to buy one that I see for sale because I can't remember off hand which ones I have already. I'll review what I have and hopefully fill in the gaps in my library over time.