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A "smart" gas meter for buildings large and small.
If a siege situation eventuates in the premises, the meter can be sent a remote command to open a high volume connection to the interior of the building allowing law enforcment personnel to pump in an incapacitating agent.
Russia's botched gassing attempt
Probably what [mouseposture] is referring to [Wrongfellow, Apr 04 2010]
||H.H.Holmes built an entire hotel on this principle. Gas
lightning, of course (it was 1890s Chicago), but to his own
specifications: in some rooms, there were gas pipes
without mantles, and the valves were located *outside*
the rooms. And those rooms' doors locked from the
outside. There was also a crematorium in the basement.
(_Devil in the White City_, by Erik Larson. Nonfiction.
||On the subject of incapacitating gas use by law
enforcement, didn't the Russian government do this a few
years back, in a hostage-taking siege situation? As I recall,
results were suboptimal, but I don't remember details.)
||Presumably this would mean that every house needed some kind of additional connector that the cops could pump their gas into.
||I wouldn't have thought it would be tricky for the perpetrator to damage this connector badly enough that a new one needs to be fitted before the pumping can commence. At that point, if it's near enough to the house, the hostage-taker can shoot at anyone who tries to repair it, rendering it effectively useless.
||Maybe the gas distribution infrastructure should be extended to deliver some kind of narcotic alongside the normal gas? This sounds like a lot of effort for the result it achieves.
||//Maybe the gas distribution infrastructure should be
extended to deliver some kind of narcotic alongside the
normal gas?// Makes sense, in the right context. I could
definitely imagine the North Korean government wanting to
do this. Problem (for them) would be implementing the gas
||Couldn't the cops, faced with this situation, dig up
the gas line (or access it via a manhole), shut the
building's gas off from a valve, and supply whatever
gas they wish in its place?
||[21_Quest] Rather than rely on memory, read
link. Failure promptly to identify the incapacitating agent
hospitals treating gassed hostages cost hostages' lives.
use of gas was presumably optimal (i.e. "least of evils")
some point of view, but minimizing casualties* does not
seem to have been weighted very heavily by whoever
planned that operation.
||*Well, perhaps he was minimizing casualties among his own