Governments would monitor this discussion only if they thought they might gain information about explosive detection, they would really like to have better ways of doing explosive detection and would take it from any source and validate on their own. There is nothing wrong with people researching, building, talking about, ... explosive detection, now if we started to explore defeating the existing technologies they might get concerned.
Someone who is stupid enough to be discussing nefarious affairs with explosives on an open forum with the readership like this one is very probably too stupid to build a device that would work.