In what circumstances have courts found that the use of a magnetometer as a secondary search procedure in the hall of justice is permissible under the fourth amendment?

In McMorris v. Alioto, 567 F.2d 897 (9th Cir.1978), a case very similar to this one, we held that courthouse security procedures in the San Francisco Hall of Justice, including the use of a magnetometer, fell into the category of permissible administrative searches. Id. at 900-01. Taking judicial notice of threats of violence directed at courthouses that had given rise to an urgent need for protective measures, we concluded that security measures that included a pat-down search as a secondary search procedure were reasonable under the fourth amendment. Id. at 900.