>Hmm.  So a group of thieves would only need to surprise the guard on his
>rounds, tie him up somewhere, then have one guy walk around as usual with
>the ID tag.  Meanwhile the rest of the gang has all weekend to clean the
>place out.

Which is why he needs to use it to log in at the guard house at the end of
the round. If he does not then an alarm should be raised to the security
company premises as originally mentioned. If the gang can get into the guard
house to do this then there is a problem in the way the system is
implemented which is beyond any logging system. If the ID unit is used as a
key system to gain access then that is also a security flaw unless used with
some sort of PIN system.

It may be that using a PIN number at each logging point would help with any
security problem, but this is still not a total solution.

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