Are Surveillance Cameras effective?

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Are Surveillance Cameras effective?
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Cities are thriving environments for lawbreakers.
Crimes like robberies, murders, speeding, DUI etc
are common in cities. Because of these, law
enforcement always tries to develop more ways and
technologies to arrest or monitor the criminals.
State police regularly monitor freeways for drug
traffickers. Some police are also assigned to go
undercover and risk their lives at stakeouts.
They also use realistic cardboard cutouts of
police officers and cars so that the criminals
would hesitate when they see them.Complicated
databases and citizen identification are new
technologies used to monitor the criminals. Video
surveillance or security cameras are more common.
Security cameras are located in many public
places where crime is most likely to happen.
These cameras provide evidence. Estimating the
efficiency of surveillance cameras in preventing
crime is also a problematic issue as there are
several vague variables to consider. No one can
entirely be decisive that a crime has been
planned just because something suspicious showed
up on the surveillance videos. Other factors like
the city's economy, law enforcement strategies,
and even the season could contribute to this
vagueness.
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• According to recent studies, seventy three
  cameras in an area have never recorded a footage
  that helped solve crimes. It was a problem for
  the local government as they invested millions of
  dollars for those equipments only to find out
  that those systems was not as efficient as they
  were predicted.So are these cameras useless?
  No.
• Criminals think twice before committing crimes
  if they are aware of the hidden cameras. In fact,
  many police departments stated surveillance
  cameras have made the crime rate drop to 30
  percent. This is especially true and important in
  high-crime neighborhoods.
• Aside from the more notorious crimes, these
  cameras also reduced auto-related crimes and
  accidents 41 percent. Above all, these cameras
  are always helpful for post-crime investigations.
  CCTV cameras transfer signal to specific
  monitor at distant place and surveillance cameras
  work on IP network. If you are planning to buy
  one of these, you could search online for outdoor
  CCTV or network IP surveillance cameras security
  supply. 123 security products sells efficient
  security supplies.