I'm all for it. I think there need to be a database of people that says "this person is okay, this person is dangerous". I don't think it's intrusive, and would only afect us if we needed access to something where security was of either minor or utmost importance. I hope this gets implemented. If we are going to thwart terrorism, it will take more than the lackluster x-ray devices we have in place today and a simple patting down by a security guard. I believe this to be a viable solution.
In plane, I'd like to see some kind of knock-out gas in the passenger compartment w/ the cockpit sealed off and fortified. Terrorist threat? Hijacking? Seal the cockpit, release the gas, land the plane, subdue the terrorists, and then wake everyone up. No struggle... no guns for pilots. That would make sense to me on a plane.
I hope there's a lot of feedback on this brain fingerprinting lotd. It'd be interesting to hear what people think.