No, in that case you are obviously a terrorist and you deserve 30y behind bars.

It might work since one has no expectation of privacy in public and taking picture of him is perfectly legal, making a copy of the document (taking picture) on the machine with no expectation of privacy would be perfectly legally too.

Probably not though. The CFAA still says it's illegal to do anything on a computer that you're not authorized to use. It has nothing to do with expectation of privacy.

Does CFAA apply to FBI as well?

No, ikeboy pointed out below that the CFAA doesn't apply to the government.

Someone not having a reasonable expectation of privacy in a thing does not mean it is legal to hack their computer.

The CFAA does not depend on any expectation of privacy, only authorized usage.

That makes no sense. Why aren't the FBI in violation of CFAA, then?

Expectation of privacy defines the bounds of a search. Police searches are not permitted to conduct otherwise illegal activity Just because they are searching.

CFAA doesn't apply here.

https://www.law.cornell.edu/uscode/text/18/1030

>(f) This section does not prohibit any lawfully authorized investigative, protective, or intelligence activity of a law enforcement agency of the United States, a State, or a political subdivision of a State, or of an intelligence agency of the United States.

So something can't be illegal for the police to do for the sole reason that it violates the CFAA. If it violates something else, I suppose CFAA charges can be added on, though.

Federal computers, too!