@7f73a7d1 I wasn't thinking of it as a "trick" so much as trying to understand what the legalities look like?

If, instead of a pendant, it were a big boom mic coming out of a backpack, would that be allowed?

(I 100% understand that Germany has very strong privacy laws, but don't have a good sense of how they intersect with the fact that everyone now carries a device with a hot mic all the time.) 

 @7f73a7d1 So if it had a sticker on it that said “This is a live recording device" it'd meet local laws? (Is this Germany? Austria?) 

 @7f73a7d1 How does that interact with the existence of voice recorders or cell phone memo apps?