A hand-held spectrometer can penetrate sealed containers in seconds and identify a wide range of solid and liquid explosives using laser technology.
http://www.tsa.gov/blog/
TSA has piloted two handheld explosive detection systems in the airport environment: the Nomadics, Inc. Fido PaxPoint and the Smiths SABRE. TSA worked with the manufacturers, DHS Science & Technology Directorate, and the national science labs to modify the Fido PaxPoint to scan bottled liquids.
A search without consent?