Maps of the distribution of dark matter have been produced using weak gravitational lensing, e.g. in the COSMOS survey.

http://www.spacetelescope.org/news/heic0701/
http://www.astro.caltech.edu/~rjm/cosmos/
http://www.space.com/14176-dark-matter-biggest-map-unveiled.html

If the vice-principal does not know anything about electronics then he should bring in one of his colleagues who does. If none of the teaching staff know anything about electronics (though surely at least one of the science or technology teachers will) the school lab technician(s) almost certainly will as they need that knowledge to do their job. Then let the staff member examine the device and see if it matches the description/explanation/functionality described by the student.

I guess the principle could also factor in the times he knows of where 11 years olds have made bombs with evil intention . . .

Less social and economic mobility; ...

Au contraire...
http://www.lse.ac.uk/collections/pressAndInformati onOffice/newsAndEvents/archives/2005/LSE_SuttonTru st_report.htm

In a comparison of eight European and North American countries, Britain and the United States have the lowest social mobility
...
A careful comparison reveals that the USA and Britain are at the bottom with the lowest social mobility. Norway has the greatest social mobility, followed by Denmark, Sweden and Finland. Germany is around the middle of the two extremes, and Canada was found to be much more mobile than the UK.

http://cep.lse.ac.uk/about/news/IntergenerationalM obility.pdf