Lie Detector Test Kit

[Bessie Murrillo]

Althoughthe results are usually inadmissible as evidence, lie detector tests can nonetheless be useful in interrogations during criminal investigations. Many confessions have been made after a criminal suspect fails a lie detector test. However, any results of a lie detector test conducted on a criminal defendant that become publicized can be very influential on public opinion of the case, especially if picked up by the news media.

Federal and most state law bans employers in the private sector from requiring employees and prospective employees to submit to a lie detector test. If an employee decides to submit to a test, these laws also prohibit an employer from taking adverse employment action against an employee based upon the results. Some states allow exceptions for embezzlement concerns, in which case the testing procedure is heavily regulated and often monitored. The government may use polygraphs as part of personnel screening for employment, especially for positions dealing with national security.

I have had mixed feelings about this question, but I have come down to the side of not using the lie-detector approach. Basically, my take is this: trying to get your partner to take a lie detector test is probably not an effective way to get the answer you want, and it is likely to simply cause more trouble, doubt, and pain.

If you are comfortable taking a refusal to go get polygraphed as proof positive of guilt, then it might be a worthwhile plan. But I suspect that once you find yourself in that position, and your partner is putting up a really strong reaction, you are likely to feel less sure about it.

Apart from not helping the situation much, demanding your partner go through with this probably just compounds things. It further entrenches the mistrust in your relationship. Now, you and your partner are at loggerheads over the level of trust that exists or should exist, in the relationship.

If you can both connect and empathize with each other, it will help in resolving the issue. Communication is key when it comes to building and maintaining a healthy relationship. Try to approach the conversation with an open mind and a willingness to listen rather than a litany of accusations.

Finding a couples counselor who can guide you through this difficult situation is an excellent idea. We can help you have a meaningful conversation in which both of you can say your piece and be heard. In a safe space like this, it is much easier for someone who has done wrong to come clean about it and work through the problem.

I need to clarify about the calibration of metal detector test pieces. How do we validate the strength of the metal pieces which are used for the periodic internal calibration of a metal detector used in a food industry? Is there a specific requirement in BRC Food issue 7 standard which requires the validation of test pieces? Will it be raised as a nonconformity against the BRC Food standard if there is no any record regarding the strength of the metal pieces used in the metal detector? Appreciate if anyone can help me in this regard......

BRC Issue 7 section 6.4 Calibration and Control of Measuring and Monitoring Devices spells out the need to be "checked" and when necessary "adjusted" at a predetermined frequency, based on risk assessment . This means all your measuring devices, scales, thermometers, metal detectors, instruments used to test your products ( moisture meters/water activity ect), for product safety and legality should be calibrated at some pre-determined frequency...based on our risk assessment, we chose annually. We bring in a 3rd party company to perform these certifications and then we have documentation to prove it was done. For metal detector test piece validation, we retain all purchase records from the test piece manufacturer and our 3rd party certification company verifies that our test pieces work properly.

(I'm not a MD expert but I guess one could dig down to the actual intensity of the MD signal which i believe some MDs now auto-do as a set-up check but signal will presumably vary with instrument. I think the more typical operational calibration/validation simply involves a reject/no-reject action.

Thanks Charles, we are on the same page....our 3rd party certification company uses our standardized test peices and their own to verify that the machines are working at their most sensitive level possible....that's all I was trying to say. Thanks again.

I read this article from the google testing blog. Basically, the idea expressed in the article is that it's a good practice to avoid writing "change-detector tests". This code is given as an example to avoid

To be honest, I don't really understand why this is a bad test. My approach would be to unit test part1.process, part2.process and then to do exactly this test. Then, with time, if the behavior of this method is changed in a way that the methods are not called as expected (let's say we add a condition depending on the first method call), the test will fail and I will have to make sure that the change of behavior is expected and desired.

The code snippet you have shown is an excellent unit test, provided that the unit under test is an abstract part combinator, and does not have a more concrete responsibility within the problem domain of the application.

For example, assume that the actual point of this piece of code is to calculate an interest rate. As an implementation detail, this calculation was split into two pieces. A test that is not about interest rates is then a useless test. The shown test would pass whether or not the calculation is correct. It does not ensure that the system behaves as expected, instead it asserts that the system is implemented in a particular manner. In general, such tests are not a good idea. They are fragile, and will break whenever the system is refactored. The blog post is correct in asserting that such tests can cause more work than they are worth.

However, the code is presented without context, and it may well be the entire point of that code to sequentially combine such processors. Such code might be part of an abstract rule engine library, or more generally as part of a Composite Pattern. It is then absolutely correct to test that the two processors are invoked, and are invoked in the correct order. I have written such code and have written such tests without a bad conscience.

So in either case, the question to be asked is: What is the point of this code, why does it exist? What does this abstraction represent? What interface does it offer to callers? What behaviour is documented? Then test its behaviour, and not the mechanism through which it is implemented.

I'm not surprised you are confused, the Blog is as clear as mud as to the real problem. To be considered a useful and meaningful unit test, the test code should be testing the objective not the implementation.

Assume that the purpose of process is to turn "w" into "w12", the requirement is for partOne to add the "1" and partTwo to add the "2". The test doesn't actually prove that test objective is achieved.

A polygraph, often incorrectly referred to as a lie detector test,[1][2][3] is a junk science[4][5][6] device or procedure that measures and records several physiological indicators such as blood pressure, pulse, respiration, and skin conductivity while a person is asked and answers a series of questions.[7] The belief underpinning the use of the polygraph is that deceptive answers will produce physiological responses that can be differentiated from those associated with non-deceptive answers; however, there are no specific physiological reactions associated with lying, making it difficult to identify factors that separate those who are lying from those who are telling the truth.[8]

In some countries, polygraphs are used as an interrogation tool with criminal suspects or candidates for sensitive public or private sector employment. Some United States law enforcement and federal government agencies,[9][10] and many police departments use polygraph examinations to interrogate suspects and screen new employees. Within the US federal government, a polygraph examination is also referred to as a psychophysiological detection of deception examination.[11]

Assessments of polygraphy by scientific and government bodies generally suggest that polygraphs are highly inaccurate, may easily be defeated by countermeasures, and are an imperfect or invalid means of assessing truthfulness.[12][13][6][14] A comprehensive 2003 review by the National Academy of Sciences of existing research concluded that there was "little basis for the expectation that a polygraph test could have extremely high accuracy."[6] The American Psychological Association states that "most psychologists agree that there is little evidence that polygraph tests can accurately detect lies."[8]

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