The CSI team suspects foul play when a chemistry teacher's science experiment goes horribly wrong. Guest stars include Marissa Jaret Winokur as Principal Dawn Meadows, Skipp Sudduth as Ed Lusk and Bella Thorne as Hannah Hunt, a student. (TV-14 V)
Sara and Greg are quarantined after responding to a crime scene that's contaminated with a deadly pathogen. (TV-14 V)
The CSI team investigates a robbery and fatal shooting at a medical marijuana shop. (TV-14 V)
Finlay must deal with a bomb planted in her car, while Russell gets a call from someone claiming to be the Gig Harbor killer. Mark-Paul Gosselaar guest stars as twins Jared Briscoe and Paul Winthrop, and Mark Valley guest stars as Detective Daniel Shaw. (TV-14 L, V)
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