Or get a burner

Why do you need an ID? Leave it in your car if you're driving.

I don't think there's a single state that requires you to actually carry documentation.

https://en.wikipedia.org/wiki/Stop_and_identify_statutes

These are the states that require you to at least verbally state your name, and only if the officer has reasonable suspicion that you have or will commit a crime.

They can ask your name. You may not have to answer.

Research your state's law on this before you go. It's in the link.

They’re detaining people with Real IDs for hours at a time. It likely makes no difference.

And get a burner.

Leica digital or chemical film?

Its important because you endanger not just yourself but anyone who is possibly linked through your activities. Your actions are your own responsibility. If you are able to protect others in this Situations you should.
And i hope you only document voilation oft power with your leika and not others protesting.

• EFF Guide.

Shared here for public benefit.

Before going to a protest, demonstrators or observers should note that their cellphones may subject them to surveillance tactics by law enforcement. If your cellphone is on and unsecured, your location can be tracked and your unencrypted communications, such as SMS, may be intercepted. Additionally, police may retrieve your messages and the content of your phone if they take custody of your phone, or later by warrant or subpoena.

• EFF Guide.

Shared here for public benefit.

Before going to a protest, demonstrators or observers should note that their cellphones may subject them to surveillance tactics by law enforcement. If your cellphone is on and unsecured, your location can be tracked and your unencrypted communications, such as SMS, may be intercepted. Additionally, police may retrieve your messages and the content of your phone if they take custody of your phone, or later by warrant or subpoena.

• EFF Guide.

Shared here for public benefit.

Before going to a protest, demonstrators or observers should note that their cellphones may subject them to surveillance tactics by law enforcement. If your cellphone is on and unsecured, your location can be tracked and your unencrypted communications, such as SMS, may be intercepted. Additionally, police may retrieve your messages and the content of your phone if they take custody of your phone, or later by warrant or subpoena.

• EFF Guide.

Shared here for public benefit.

Before going to a protest, demonstrators or observers should note that their cellphones may subject them to surveillance tactics by law enforcement. If your cellphone is on and unsecured, your location can be tracked and your unencrypted communications, such as SMS, may be intercepted. Additionally, police may retrieve your messages and the content of your phone if they take custody of your phone, or later by warrant or subpoena.

Even with a libre OS and all radios turned off? (So to use the phone as a camera and offline navigation)

They likely have the data to show it didn't move at all. Eg it wasn't on your person.

You underestimate how much of a couch potato I am. Not moving is normal lol.

There's legal requirements, then there's practical dealings with officers in the field. Seems to me that these days if you're "undocumented" you're asking to be sent to processing which can be a quick trip to a center somewhere across the country, if that's the mood they're in. After you get out you can try to sue them, maybe even win, but how long before you collect your damages?

• EFF Guide.

Shared here for public benefit.

Before going to a protest, demonstrators or observers should note that their cellphones may subject them to surveillance tactics by law enforcement. If your cellphone is on and unsecured, your location can be tracked and your unencrypted communications, such as SMS, may be intercepted. Additionally, police may retrieve your messages and the content of your phone if they take custody of your phone, or later by warrant or subpoena.

• EFF Guide.

Shared here for public benefit.

Before going to a protest, demonstrators or observers should note that their cellphones may subject them to surveillance tactics by law enforcement. If your cellphone is on and unsecured, your location can be tracked and your unencrypted communications, such as SMS, may be intercepted. Additionally, police may retrieve your messages and the content of your phone if they take custody of your phone, or later by warrant or subpoena.

Pointless, unless you leave the roomba running outdoors. Indoors you don't have GPS coverage, and your phone is logged onto the same cell tower anyway. Might just leave it stationary at home, same outcome.

When I shut the lid on my work computer I assumed it was "off" or at least inactive. My home network showed me it was continuing to "check in" throughout the night.

Even sitting on a couch moves your phone more than simply laying on a table. They can use accelerometer data to determine how, if at all, it moved.