Catherine and Grissom in “Boom”

Catherine

The sperm from the condom was frozen at 10:15 am. It's all heads, no tails.

Grissom

I'm not quite up to speed about the preticulars of....

Catherine

It takes about 7 hours for bacteria to eat away at the tails, that places time of ejaculation at around 2am. But Kristy's death was at around 6am.

Grissom

Well, that suggests a lag between ejaculation and Kristy's murder. But that doesn't disprove Nick's presence at the time of the homocide.

Catherine

You could be a little more supportive.