In the UK we have the Anti terrorism laws and they are being abused as we speak.
You can be arrested for being in possesion of documents that could aid terrorism, this would include my school chemistry books or even a file downloaded from the net, one of them I have about the construction of various devices including how to make a microwave transmitter would also be "suspect".
I would ask everyone to watch The Power of Nightmares and read George Orwells classic 1984.
Those who support a DNA database should read this :
Tomorrow's fish and chip paper: DNA database: 1 in 8 records are incorrect; 1 in 7 are replicates