WW2 Metal Detecting - Legal?

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So I have a metal detector and I'm curious about booking a tour for the Courland Pocket which lets people search. My main concern is that it's illegal; I won't book if it's illegal (obviously).

I found this website:
http://battlefielddiggertours.com/visit-the-courland-pocket/

They say they turn in any human remains and report EROW, but I'm a little suspicious. I figure that they're legal just because they're offering tours, which must be on their property.

My plan;
>try to book a tour
>ask them if it's legal
>ask local police if it's legal

Apart from this, I know some people with property that covers most of a USAF base from WW2, which I could go to. But the thought of detecting on a Nazi battlefield is too cool, also with reporting remains to the authorities so they can finally be buried.

My biggest fear is that I book a shady tour with some grave robbing cowards that pose with skulls and laugh, illegal black diggers piss me off

https://www.youtube.com/watch?v=iZk4lzlSqZs