I remember that one. The cop was stupid enough to get his gun snatched, and then he was stupid enough to quench the MRI for that!
Here's the docket for the resulting court case. In their response this year the LAPD seem to have summarily denied everything.
https://www.courtlistener.com/docket/69172475/noho-diagnostic-center-inc-v-city-of-los-angeles/
Even that article fails to mention if and when the magnet was quenched.