| 摘要 |
Systems and methods for detecting efforts to thwart discovery of a thing, the methods including: using a detector system in an area to detect a reaction product of a thing with descenter; producing with the detector system a detected reaction product level; comparing the detected reaction product level to a normal level of the reaction product in the area; and upon determining that the detected reaction product level is different from the normal level, providing an indication of possible presence of the thing based on said different level.
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