Through the Fog

Elementary 6×14

Bridget Tanaka: If it was a chemical attack, he'll be safe once his clothing and skin have been decontaminated. If it was biological, any pathogen will need time to incubate before the host becomes contagious.

Bridget Tanaka: ...frankly, we might not know what we're looking at until people start getting sick. Symptoms usually tell us what we're up against before our tests can confirm it.

Holmes: Don't play dumb with me. You're not smart enough.

Holmes: [The photos] not time-stamped, but the clock in that photograph tells us it's 6:58 p.m. when it was taken by the perpetrator. That gives us a time, of course, but not a date. Luckily, there is ample astronomical data to tell us the sun's relationship to New York City every single day of the year. So we match the shadow pattern, we note the position of the light, and that should give us the date in which the precinct was scouted. We then look at the visitor logs for that day, see who was here, and see if anyone came back today.
Watson: Right.

Holmes: One impossible problem at a time, please.

Holmes: It's hard facing a diminishing of one's autonomy.
Watson: Yeah, I gotta ask her again.
Holmes: Respectfully, it's not the way that you're asking. It's that you're asking at all. You can't ask someone to hand over the keys to their life. You have to demand them. Your mother's not going to like the news, but... at least she's gonna hear it from someone she loves.

Holmes: For the sun to have cast that angle of light at exactly 6:58 p.m., the photograph must have been taken on... July 2.
Det. Bell: You sure?
Holmes: I'll spare you a lecture on solar orbits and heavenly mathematics and just say yes, I'm sure.

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