Mr. Specter. Then were there any other relevant questions in the first series?
Mr. Herndon. There were no other relevant questions in the first series.
Mr. Specter. Was there anything else in the first series which is significant enough to comment on by way of analysis of the overall examination?
Mr. Herndon. No other than to say that the total chart minutes for series 1 was 2 minutes 25 seconds in duration of time.
Mr. Specter. Is there any fixed limitation on how long a series can run?
Mr. Herndon. Yes, it is generally conceded that a person should not be run on the polygraph beyond perhaps 4 minutes, inasmuch as after that time the pressure on the arm cuff can become discomforting and irritating to the examinee.
In view of the fact that there was a question here of possible effect on Ruby’s health, I attempted to maintain all my questioning within an approximate 3-minute period to insure no damaging effect on his physical condition.
Mr. Specter. Is there any overall limitation on the amount of time that a person can appropriately take a polygraph examination?
Mr. Herndon. Yes, there is a limitation. Certainly if a person is interviewed with polygraph at great length, in due time he is bound to become desensitized to the technique. In other words, the pressure on his arm and the technique itself becomes less valid as the increase in time proceeds.
Mr. Specter. Did Mr. Ruby ever become desensitized to the technique?