Upvote:2
Normally, yes.
Normally, no.
I don't think so.
I am crossing US security checkpoints about 50 times a year, often with two laptops, and never got a question.
However, you should to be prepared to confirm ownership (by saying 'yes this is my laptop, not with paperwork), and start the booting if asked.
In Germany, when boarding flights to the US, they are more picky, and sometimes do explosives testing (they are wiping it with a probe and analyze the dust on it).
Nowadays, you probably stick out more if you travel without a laptop...
Edit: you are not allowed to have illegal content on it, like child p**nography, Nazi propaganda, etc. Not that they'd ever check.
Upvote:2