(818) 883-6969
John Grogan Polygraph

You should know:

During a Bakersfield polygraph exam, we are recording microscopic changes to blood volume, skin conductance, upper breathing and lower breathing, as the examinee responds to a rehearsed 10-question script.

The examinee needs to sit very still. Answering yes or no with his/her mouth only, not with any head movement. Answering all questions at the same volume.

One to four key questions from the client will be used as the heart of the exam. Be sure that each question is no more than 20 words long each, that the questions have no 'and' or 'or' in them, and that there are no 'softening' words (we don't say 'affair' or 'sleep with'; we say 'have sex with' or 'have sexual contact with').

The computer instantly and accurately scores the charts in between each test, so we will know which questions they did good on and did bad on, before we go on to the next test chart 5 minutes later.

If all guidelines and instructions are followed, we can
expect in the area
of 95% accuracy.

  Administering only those testing
techniques approved by all four: 
Polygraph Examiners of America,
American Polygraph Academy,
US Government Polygraph Institute,
and American Polygraph Association

English and Spanish.

Free consultation.


John Leo Grogan polygraph
Polygraph Examinations
in the Kern County
California area

Serving Bakersfield polygraph, Shafter, Wasco polygraph , Delano,
Kern polygraph, McFarland, Rosedale, Mesa, and other nearby cities

no deposit required for a Bakersfield polygraph

Just a simple site to explain what to expect,
and how to make lie-detection work for you!
Grogan polygraph
Bakersfield polygraph cost

Verify first that:

1 . . . your exam will be done on a modern $6000 computerized polygraph instrument, NOT on an old antique 'roll of chart paper with 4 pens'. You want the accuracy and sensitivity of a computerized instrument, and you want a computer to blindly score the test charts (you do not want a human to be doing the scoring, someone who can miss something or can be biased to be too easy or too hard).

2 . . . the accuser/client (spouse or victim) would be allowed, if desired, to quietly monitor the entire exam from an out-of-examinee's-view area or from a remote area.

3 . . . your examinee will be tested 3 times in a row, using standard 10-question charts (best for accuracy); with 20 seconds in between each question it means he/she will actually be 'on the polygraph' for 3 five-minute periods, with a short break in between each.

4 . . . you are permitted to arrive with the 1 to 4 key questions you would like to have asked during the exam. Have them written out, put plenty of thought into them. If you think that your situation needs more than 4 questions to cover it, speak to your examiner about this ahead of time.


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Getting the truth for you

Polygraph is the world's most accurate lie-detection tool.

In virtually every city in the United States,
you can not become a police officer without first passing a polygraph examination.
Continual improvements in polygraph technique and instrumentation has
increased the ability to pinpoint truth and lies better than just a decade ago.

But not all have the same training & experience.
Contact us for a free consultation to see the difference.
Our staff of experienced lie-detection professionals are available to serve you days, nights, and weekends, at
our locations or at your residence or business location.

Bakersfield polygraph office

Advise which lie-detection district you are in:

Kern Polygraph North District:
Bakersfield, Bodfish, Buttonwillow, Caliente, Cantil, China Lake, Delano, Devils Den, Earlmart, Glennville, Inyokern, Johannesburg, Kern, Kernville, Lost Hills, McFarland, McKittrick, Mountain Mesa, Oildale, Pond, Randsburg, Richgrove, Ridgecrest, Rosedale, Shafter, Squirrel Mountain Valley, Tupman, Wasco, Weldon, and Wofford Heights.

Kern Polygraph South District:
Arvin, Bear Valley Springs, Boron, California City, Derby Acres, Dustin Acres, Edison, Edwards, Fellows, Ford City, Frazier Park, Golden Hills, Gorman, Greenacres, Keene, Lake Of The Woods, Lamont, Lebec, Maricopa, Mettler, Mojave, North Edwards, Pine Mountain Club, Pumpkin Center, Rosamond, Taft, Taft Heights, Tehachapi, Valley Acres, Weedpatch, and Wheeler Ridge.