The Data on the Use of the Polygraph to Detect

The data on the use of the polygraph to detect deception indicate that:

A) it works only when the questions are specific
B) it is accurate in fewer than 50 percent of the cases
C) the answers of both the guilty person and an innocent person must be compared
D) it is impossible to 'beat the machine'
E) it is accurate around 70 per cent of the time