My concern with tests such as this, Eckman's "micro-expressions," polygraph testing etc is the selective ways they are used and interpreted.
Often, when it suits the authorities, they will trot out these tests as validation for whatever it is they are claiming, and vice versa. For example, here in Scotland, an MP by the name of John Lamont was most vocal about rolling out polygraph testing across the country on sex offenders to "check" if they were safe to be released, or to remain at liberty - fail the polygraph and they either don't get out, or are returned to jail.
When Luke Mitchell and his mother both passed polygraph tests, the same Mr Lamont was equally vocal in insisting that prisoners should not be allowed to take the tests, and publicise the results "in these circumstances." Mr Lamont, and others like him, were happy to accept polygraph results as "proof" of guilt, but not as "proof" of innocence.