thoughts as passwords

Read this interesting piece from techdirt :
"Wired News is looking at the possibility of one day being able to use your thoughts as your password for better security. The idea being that the computer would recognize your specific brainwaves, that couldn't easily be copied by someone else. Some people believe this will never happen, as distinguishing on that fine a level of brainwaves might be impossible. However, even if it was possible, you have to wonder how effective it would be. It could work for normal logging in... but how does it work when you don't want to log in, but someone else wants you to? Ever try to not think about a certain thing? Our brains aren't really wired that way..........."

If its thought dependent what about when we are in a hurry, or a disturbed state of mind, or when really really angry !!!! will the brain waves be the same and consequently the login process smooth ?

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