This might be slightly off topic, so forgive me please, but now that I think about it, wouldn't barrier foam be pretty useful for restraining shadowrunners? I just had an idea for a sort of palm-print/pressure-reader, involving sticking your arm down a foot long tube and grabbing a rod to open a secure area. The rod would act as a biometric reader for the first part, reading the palm print. Then for the second part, the user must turn the rod clockwise to the 12 and 6 position. The rod would read the pressure locations of the hand gripping it and compare it to previous readings of grip strength and highest pressure record for certain areas. This would be extremely useful for getting around issues involving palm-print glove printers, as hand pressure would be harder to fake. If the reader gets a negative confirmation, the tube would fill up with quick acting freeze-foam (from the top of the hole to the bottom, of course...) and the intruder would be stuck to a wall by his arm for at least a few combat turns, giving security a few potshots for their hubris.
