Don't know, but I also put the caveat... "or one like it" in my original post and used the phrase "rumour has it".
I'm not fully aware of the legal powers of park rangers, but I'm assuming they might have wanted the SD cards to look for evidence of breaches of the laws that they are entitled to enforce (harassing wildlife, stealing picnic baskets, that sort of thing).

I'm not fully aware of the legal powers of park rangers, but I'm assuming they might have wanted the SD cards to look for evidence of breaches of the laws that they are entitled to enforce (harassing wildlife, stealing picnic baskets, that sort of thing).