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Method

Our method

How a sweep runs step by step, which instrument we use and why, and what each one can and cannot detect.

The sweep, step by step

  1. Secure first contact

    We talk through a channel outside the suspected space and devices, and listen to your concern, the space and your safety situation.

  2. Assessment and threat review

    Together we consider who might want what information, and how; then we define the areas to inspect and the priorities.

  3. Plan and quote

    Based on size and risk, we plan which methods are needed and how long they will take, and send you a written quote.

  4. RF survey

    We map the radio environment, account for each known transmitter and trace signals whose source is unclear.

  5. Electronic sweep

    With NLJD, thermal camera and optical lens finder we sweep walls, furniture, ceilings and objects surface by surface for circuitry, heat and lenses.

  6. Physical and line inspection

    Sockets, fittings, junction boxes and suspicious objects are opened or inspected by endoscope; lines and networks are checked where relevant.

  7. Verification

    Every suspicious reading is physically verified. Alerts from innocent electronics are ruled out and real findings are documented in place.

  8. Report and next steps

    You receive a written report of the areas, methods, findings, limits and recommendations, and we plan next steps with you.

Instruments and their limits

01

RF spectrum analyzer and detector

Displays radio frequency activity in the space, helping separate known transmitters and trace unexplained signals to their source.

Can detect

  • Live analog and digital audio transmitters
  • Devices sending audio or data over the mobile network, while they transmit
  • Devices sending video or audio over Wi-Fi or Bluetooth
  • New, unexplained signals that deviate from the baseline

Cannot detect

  • Devices that are switched off or have a flat battery
  • Audio and video recorders that only store to memory
  • Devices that transmit briefly at long intervals and stay silent during the survey
  • Wired microphones that carry audio over a cable without transmitting
02

Non-linear junction detector (NLJD)

Detects the harmonic response that semiconductor junctions in electronic circuits return to the signal it emits.

Can detect

  • Electronic circuits in devices that are switched off or have a flat battery
  • Circuits concealed inside walls, furniture, ceilings and objects
  • Audio and video recorders that never transmit

Cannot detect

  • What a circuit does; physical verification is needed
  • Circuits behind dense metal or buried deep, with full reliability
  • Software-based threats on phones and computers
03

Thermal camera

Shows temperature differences on surfaces, making the heat from working electronics visible.

Can detect

  • Heat from a working device showing through a wall, ceiling or object
  • Unexpected heat inside a socket, adapter or smoke detector
  • Electronics that keep running while a vehicle is parked

Cannot detect

  • Devices that are switched off
  • Very low-power devices behind thick insulation
  • What a device is or what it records
04

Optical lens finder (hidden camera lens detector)

Uses the way camera lenses reflect light back towards its source to show hidden lenses as a bright point.

Can detect

  • Pinhole camera lenses built into objects
  • Camera lenses in line of sight, even when switched off

Cannot detect

  • Audio listening devices
  • Lenses out of line of sight or recessed at an awkward angle
  • Some lenses behind dark or filtered surfaces, only to a limited extent
05

Inspection endoscope

A thin, flexible camera for viewing hard-to-reach voids in walls, ceilings, furniture and vehicles.

Can detect

  • Devices, cables and added parts placed in voids
  • Signs of tampering in places you cannot see without dismantling

Cannot detect

  • Fully sealed voids with no access opening
  • Whether a device is working
06

Physical inspection

Systematically opening and checking sockets, fittings, furniture, objects and vehicles by hand and eye.

Can detect

  • Any physical device or added cable, transmitting or not
  • Tampering such as disturbed panels, covers and screws
  • Confirmation or elimination of alerts from other instruments

Cannot detect

  • Embedded points that need breaking in or dismantling, without your approval
  • Software-based threats on phones, computers and networks
07

Line analysis (telephone and wired lines)

Electrical measurement and cable tracing on telephone, intercom and building cabling.

Can detect

  • Taps, branches and abnormal loads on lines
  • Microphones wired to spare conductors
  • Desk phones and intercom units with added parts

Cannot detect

  • Interception at carrier or network level
  • Mobile calls and internet-based calls
08

Digital forensic tools

Analyse the settings, logs and data of phones, computers and network devices.

Can detect

  • Traces of known spyware and stalkerware
  • Unauthorised management profiles, device administrators and suspicious permissions
  • Remote access tools, email forwarding rules and open sessions
  • Network devices that don't match the inventory, and fake access points

Cannot detect

  • Advanced commercial spyware that leaves very few traces, in every case
  • Anything remotely, without the device in hand
  • Carrier-level interception, or the contents of devices without the passcode

We measure, we don’t guess

A sweep against technical surveillance is not a check with a single gadget. Each instrument sees one kind of threat and misses another, so we build every job as a plan of methods that cover each other’s blind spots. The most important lesson of our 25 years of experience is that method matters more than equipment.

Four principles

No interpretation without measurement. Conclusions about a space come from measurement and physical inspection.

Every alert is verified. Each warning from an instrument is checked physically. An unverified reading is not a finding, and an innocent electronic component shouldn’t worry you unnecessarily.

Limits are written down. Our reports state what we couldn’t inspect and what each method cannot see, as well as what we found. A sweep verifies the space at the time of the sweep; it is not a promise about the future.

Confidentiality by design. Our team is anonymous; we don’t share our work, clients or findings. For corporate work we sign NDAs on request.

We do not sell surveillance devices

We do not sell, rent or install surveillance or listening devices. Our only job is finding them and protecting you from them. We refer to our instruments by generic names, without brands or models, because what matters is not which device is used but how, and in what order.

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