Lately there has been a lot of discussion and questions on the site regarding polygraphs and in response I have put together this general information. Keep in mind that each agency has its own criteria and policies regarding the use of polygraphs and acceptable results.
NDI = A ‘passed’ polygraph
In the security clearance arena polygraphs are used to help determine an individual’s eligibility for a special assignment or access to specifically designated information protected within SAPs. The most desirable polygraph result would be something called NDI or “No Deception Indicated.” NDI means you passed. You can also “pass” the polygraph if you fall within an acceptable range of the NDI threshold. If you do not fall within the acceptable NDI parameter range of an agency or department’s polygraph program, your application process is terminated.