Narrow down where mice are getting in
Use repeated first and last detections to narrow where mice may enter, then verify the physical route on site.
- Question
- Where should you inspect next when several possible entry routes remain?
- Record
- The earliest and latest detections shown against labeled sensor positions on the floorplan.
- Boundary
- The first or last triggered sensor narrows the inspection. It does not verify an entry point, nest, or direction of travel.
Narrow the search before you name the route
If you are trying to find where mice are getting in, do not read one night of playback as a finished route map. Use it to make the next physical inspection smaller and more deliberate.
A total tells you how much motion the sensors recorded. Playback adds order: which positioned sensor triggered first, which followed, and where the last detection occurred before the record went quiet. The edges can provide a better field question than the busiest sensor alone.
Anchor every label to the floorplan
Sensor A only becomes useful evidence when everyone knows where Sensor A was placed. Record height, orientation, and the nearby building feature when those details affect what the sensor can detect.
- Confirm each sensor label before the monitoring night.
- Mark moved or obstructed sensors before comparing results.
- Read timestamps alongside position, not as an isolated event log.
Move toward the unanswered edge
If the earliest repeated detections cluster near one side of the monitored area, reposition a small number of sensors beyond that edge. If the latest repeated detections leave through another boundary, test that edge separately rather than assuming the two points establish direction.
The purpose is to ask a narrower question on the next night. Do not manufacture a smoother path or declare an opening before the building supplies proof.
Finish with the building
Inspect the narrowed area for an actual opening or route. The floorplan playback directs attention; the physical condition establishes what should be repaired, sealed, or tested next.
Sources and scope
The method reads detections in time order against a placement log, identifies a repeated edge that deserves attention, then asks a person to inspect and verify. It does not infer a route from one first or last event. That sequence is consistent with CDC survey recordkeeping and EPA inspection-and-monitoring practice. For food establishments, the FDA Food Code is a model that calls for routine inspection for pest evidence and protection of outer openings; local adoption and site requirements vary.
CDC: How to Seal Up to Prevent Rodents
Examples of interior and exterior locations to inspect for gaps and openings.
CDC: Integrated Pest Management: Conducting Urban Rodent Surveys
Mapped inspection records and active-sign observations that keep a sequence grounded in place.
EPA: Pest Control in the School Environment: Implementing IPM
Inspection, monitoring, recording, and evaluation as a decision cycle.
FDA: Food Code 2022
Model provisions on routine premises inspection for pest evidence and protected outer openings.
This is product-method guidance written by RodentRadar, not a site inspection report or a government compliance opinion. No review or endorsement by CDC, EPA, FDA, or another government agency is claimed here; the responsible field professional owns the physical conclusion.