I don't know where I read it, maybe here. The general rule seems to be, that after a person drowns and sinks. Some time later, usually a week to a month depending on environmental issues, the body floats to the surface. After a some number of days on surface the body will sink again. At that point it's gone forever, unless someone go down and finds it. This time of year the lake is deserted. There's a good chance that no one will see it and it might be lost forever.
I don't know the technology involved with an artificial nose, but if the chemical compounds of a body are distinct enough, I'm sure technology could be designed. There are bound to be a lot of false alarms, humans are not the most numerous organisms to drown in the lake.
Is it just me, or is three drownings a lot for one year?
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