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The possible infringement of civil liberties doesn't really apply in this example, particularly as the only persons to routinely open the machine are either the manager, who of course requested the CCTV camera be fitted, or the thief, who has chosen to commit a crime, even though signs in the room warn of "CCTV in operation".
Interesting to note in this particular case, the manager did not wish to involve the Police, but rather "address the issues" internally.
Longer term operations, including theft of computer equipment from commercial premises, fraudulent transactions in the workplace, or drugs misuse, can require covert cameras to be applied for some months .... or even years!
In these situations, the equipment will need to be remotely powered on a continuous basis, and so one technique which is a particular favourite of Doktor Jon, is to use a 'line powered' CCTV camera (only a single video cable needs to be installed).
These cameras can either be fitted with an interchangeable pinhole lens (4mm, 6.2mm, 9mm, 12.4mm or 18mm options for 1/3 format cameras, the latter two employing a range extender) which allows a very high quality image to be produced, looking through a hole of between 2.5 - 4.5mm diameter.
If you consider that the 18mm lens combination can provide a full screen image of a 6 person at thirty feet away from the camera (1.85m tall @ 10 metres), and the camera is looking through a hole 4.5mm across, that is quite impressive.
Depending on the type of operation, there are also various options for applying conventional CCTV cameras.
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