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Within the U.S. government, security clearance levels serve as a mechanism to ascertain which individuals are authorized to access sensitive or classified information. These levels often appear in employment postings for Defense related jobs and other jobs involving substantial amounts of responsibility, such as air traffic control or nuclear ...
An interim clearance may be denied (although the final clearance may still be granted) for having a large amount of debt, [41] having a foreign spouse, for having admitted to seeing a doctor for a mental health condition, or for having admitted to other items of security concern (such as a criminal record or a history of drug use.). When ...
Hydraulic clearance, in hydraulic systems; Clearance in civil engineering, including: The difference between the loading gauge and the structure gauge: the amount of space between the top of a rail car and the top of a tunnel or the bottom of a rail car and the top of rail; Air draft, applies to bridges across navigable waterways
However, granting all such individuals a blanket DoD clearance (often known as a "collateral" clearance) at the Top Secret level would be undesirable, not to mention prohibitively expensive. The government may wish to limit certain types of sensitive information only to those who work directly on related programs, regardless of the collateral ...
Homicide clearance rate in the USA has been decreasing from 93% in 1962 to 54% in 2020. [2] Some U.S. police forces have been criticized for overuse of "exceptional clearance", which is intended to classify as "cleared" cases where probable cause to arrest a suspect exists, but police are unable to do so for reasons outside their control (such as death or incarceration in a foreign country).
SCI is not a classification; SCI clearance has sometimes been called "above Top Secret", [2] but information at any classification level may exist within an SCI control system. When "decompartmentalized", this information is treated the same as collateral information at the same classification level.
A physiologic interpretation of clearance (at steady-state) is that clearance is a ratio of the mass generation and blood (or plasma) concentration. Its definition follows from the differential equation that describes exponential decay and is used to model kidney function and hemodialysis machine function:
The term "security clearance" is also sometimes used in private organizations that have a formal process to vet employees for access to sensitive information. A clearance by itself is normally not sufficient to gain access; the organization must also determine that the cleared individual needs to know specific information. No individual is ...