h a l f b a k e r y
This ain't rocket surgery.
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This arm band (wrist band, pocket accessory, cell phone
would consist of the following items:
A: several tens of very small and hard to see
recording devices of varied colors, sizes, and weights
B: smart dust for tracking with RFID's
C: a dispersal mechanism
a radio to phone home when activated.
The idea is that there's a delay before recording begins
say, seven seconds. If someone seems about to rob,
murder, mug, or otherwise be rude to the user, the user
only needs to activate this device. The would-be
would then have a seven second grace period to make
himself as scarce as possible. Failing to do so would
practically ensure prosecution as he wouldn't be able to
track down every little recording device nor rid himself
the smart dust.
Obviously that's long enough to
attack and run away but even in that case the smart dust
and rapid recording of the scene would greatly help
prosecutors by establishing time and place of death and
possibly even get a picture of the perpetrator running
bonus: helpful in preventing police
bonus: helpful if you think someone is
going to accuse you of a crime.
recording of events that don't constitute emergencies
from several angles
This idea is not baked by,
redundant with, magic because of, or a duplicate of any
of the following: gps devices, rfid dust in general,
recording things with one's cell phone, security cameras,
recording apps in cell phones, rfid tags, medical panic
buttons, walkie talkies, or scattering sensors.