Counter-surveillance sweep by Nationwide Investigations Group

In July 1994 the private detective agency Nationwide Investigations Group co
nducted an electronic counter-surveillance
sweep of my parents' home in London. They checked for radio transmitter devi
ces, and tested the telephone line for attached
bugs. They found nothing.

I am afraid that I was unsurprised at their not finding any evidence of cove
rt surveillance. It had been made very clear to me,
particularly during 1990-92, that audio, and almost certainly video, surveil
lance of my parents' home was taking place. But this
would not have been made quite so obvious unless the persecutors were confid
ent of their apparatus being undetectable using the
technology the police, or a private agency like Nationwide, would be using.

I don't know very much about the surveillance technology that has been used 
against me, but I understand that devices can be built
which switch off on receiving a coded command, and may switch on again after
 a counter- surveillance sweep has completed; that devices
may rapidly alter the frequency of transmission, "frequency-hopping" devices
 which presumably cannot be detected in a sequential scan
of the sort employed by Nationwide; and of course "probe" microphones can be
 inserted "through-the-wall", although I hesitate to
believe our neighbours would permit this.

We paid Nationwide £411.25 (including VAT) for the surveillance sweep, which
 took them about an hour and a half to complete, using
a "Professional 5000 multi-scanner, CCL UHF scanner and Guideline telephone 
tap detector." As I said above, I don't know very much
about these things, so I can't comment on the capabilities or otherwise of t
his equipment. But clearly the "watchers" are using
technology which in 1994 was beyond the detection capabilities of a good pri
vate detective agency.

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