we can say what we like, thats our freedom of speech ian , its there job to catch us actually doing it, thats the big difference, the same goes for pictures or video evidence , they have to see us doing it at the time of us filming or taking the picture, its not illegal to owning them. unless you are putting times and dates on how can they say that was taken before the ban.
I think most digital pictures and recordings etc, have something called a digital footprint, i am not really sure what it is it but baisically i think it shows when something was made or copied etc