The Pentagon Papers case says that, once revealed, classified information can be published.
How about dangerous information. Want to know how to make a fusion bomb? Start at https://www.atomicarchive.com/science/fusion/index.html. More detailed schematics are easy to find.
All that said, I am not a lawyer, and this is not legal advice.
But carrying it is unlikely to be against the law either.
The Pentagon Papers case says that, once revealed, classified information can be published.
How about dangerous information. Want to know how to make a fusion bomb? Start at https://www.atomicarchive.com/science/fusion/index.html. More detailed schematics are easy to find.
All that said, I am not a lawyer, and this is not legal advice.