One defensive measure is to regularly swap empty cards with others, but that isn't necessarily going to be easy to arrange, and won't work well without a big pool of participants.
S 12.d, where they say they will disclose information "where your safety, or the safety of others in the community, is at risk" is no doubt the section where they will roll over for the authorities without a warrant.
It's also not clear to me how you obtain a card anonymously.
I have written to them just now; if I get answers back, I'll post them here.
The privacy angle particularly bugs me.
One defensive measure is to regularly swap empty cards with others, but that isn't necessarily going to be easy to arrange, and won't work well without a big pool of participants.
S 12.d, where they say they will disclose information "where your safety, or the safety of others in the community, is at risk" is no doubt the section where they will roll over for the authorities without a warrant.
It's also not clear to me how you obtain a card anonymously.
I have written to them just now; if I get answers back, I'll post them here.