Some argue that acceptance of brain fingerprinting technology has also moved too fast and needs to be refined and tested more before it's used to convict or exonerate suspects.
"There's a lot of value in looking at brain wave activity, but there's also a lot of hype," Frank Horvath, a professor of criminology at Michigan State University told the Seattle Times.
The National Academy of Sciences recently issued a brief assessment of the technology, saying it showed promise, but still needs more study.
Farwell contends plenty of studies have already been done. He invented the test more than 15 years ago and then conducted research with the FBI, the CIA and the U.S. Navy.
"The government spent over $1 million on brain fingerprinting," he says. "We showed not only in the laboratory but in over 100 actual real-life situations that the technology was effective."