Reading brain waves at a distance

Apparently equipment exists that can read brain waves at a distance of up to 1000 feet. Since each thought or word is represented as a particular wave, a person's thoughts can be "read". If you were to say the word "cat", the brain wave has a unique signature. Hooked up to a computer, reading those waves will tell you what a person is thinking by translating the signature into a word or phrase or emotional description.