Re: Let them have the password
.. and plenty of ways to store micro sd card so concealed by other, innocuous, metal from any scans.
And there's hide in plain sight approaches, lots of SD cards, all with various junk data, openly sitting there with your camera kit.
On your mobile device is also a nice recent history of buying cheap as chips lots of SD cards off ebay, gumtree (and whatever other sites you want to add that iffy goods sellers infiltrate you want to pick, ideally pick sellers who gov agencies would preferentially profile on name. colour etc.) - odd content on SD card you bought for lots of photos? Must be from one of those batches of SD cards I got for my holiday snaps, yes officer, now you come to mention it a couple of those sellers had Islamic sounding names ....