Eh, and Feds aren't state/muni cops either; but both of the latter still have to follow the 4th (in theory).

FWIW; at camping festivals, I know your tent also is a temporary residence and requires a warrant for search.

That's because the 14th Amendment extends the "due process" requirement to the states, and under the [Incorporation Doctrine](https://www.law.cornell.edu/wex/incorporation_doctrine) respecting the 4th Amendment has been considered part of "due process".

Agreed. I was suggesting that this was a 4a issue, but replying to he comment above that we have protections similar to the ones in their country.

As I mentioned, this sounds like a case of trespassing. If it were me, I’d be pursuing charges on that basis.