[Anechoic]

The job of the fire department should be to fight fires, not to investigate crimes.

Part of the investigation is determining whether the event is actually a crime. I'd much rather have subject matter experts make the determination of arson vs. act-of-god rather than "every nail needs a hammer" police force.

[Detrytus]

Determining if it was an arson vs act-of-god should be mostly lab work, analyzing how the fire spread, whether there are any traces of flammable substances that should not be there, etc. That's what fire department should do, because they have expertise here. Analyzing security footage for potential suspects should be done by police.

[Anechoic]

Analyzing security footage for potential suspects should be done by police.

Again, it's not just "potential suspects" it's potential witnesses, or identification of potential casualties. I don't feel great about state actors of any type using facial ID, but I can think of any number of reasons why a FD might use it in the course of their duties, and I would much prefer they have it over the PD.