Many people have asked about the large machines you sometimes drive through when entering Mexico at San Ysidro / Tijuana. Here’s a clear, factual explanation.
These are vehicle inspection scanners operated by Customs of Mexico under the Tax Administration Service (SAT). They are used to detect undeclared goods, contraband, weapons, or hidden compartments — without needing to stop and search every vehicle.
☢️ How much radiation is involved?
The radiation exposure to people inside the vehicle is extremely low.
- Estimated dose per scan: about 0.01–0.05 microsieverts (µSv)
- Normal daily background radiation: 8–10 µSv per day
- Chest X-ray: ~100 µSv
👉 One drive-through scan is thousands of times lower than a medical X-ray.
❤️ What about pacemakers or medical implants?
These scanners use X-ray or gamma-ray imaging — NOT magnets.
✔ Pacemakers are not affected by low-dose X-ray radiation
✔ This is not an MRI
✔ There is no known interference with implanted cardiac devices
Pacemakers are tested to withstand radiation levels far higher than these border scanners.
🟢 Bottom line
✔ Yes, they are real X-ray vehicle scanners
✔ The radiation dose is negligible
✔ They are considered safe, including for people with peacemakers
✔ They help speed up border inspections and reduce physical searches
Rosarito 411 shares this so everyone can cross informed — not worried.
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🇲🇽🚗 ENTERING MEXICO: WHAT ARE X-RAY SCANNERS FOR VEHICLES?
Many people have asked us about the large machines that you sometimes pass when entering Mexico through San Ysidro / Tijuana. Here is the clear explanation.
These are vehicle inspection scanners operated by Mexican Customs, under the Tax Administration Service (SAT).
They are used to detect undeclared merchandise, contraband, weapons, or hidden compartments, without the need to manually inspect every car.
☢️ How much radiation do they emit?
The exposure for people inside the vehicle is very low.
- Estimated dose per scan: 0.01–0.05 microsieverts (µSv)
- Daily natural radiation: 8–10 µSv per day
- Chest X-ray: ~100 µSv
👉 A vehicle scan is thousands of times lower than a medical X-ray.
❤️ Is it safe for people with pacemakers?
Yes. These devices use X-rays or gamma rays — NOT magnets.
✔ Pacemakers are not affected
✔ It is not an MRI
✔ There is no interference with implanted medical devices
Pacemakers are designed to tolerate much higher levels of radiation than these scanners.
🟢 In summary
✔ They are actual vehicle inspection scanners
✔ Radiation is minimal
✔ They are considered safe, even for pacemakers
✔ They help expedite border crossings
Source: debbieduran
