All in a day's work?

DUBLIN, Ireland (AP) -- Ireland's major airport pledged Tuesday not to clamp any more ambulances -- after one was disabled while trying to ferry a seriously injured passenger to a Dublin hospital.

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You would think that clamping or booting an ambulance would obviously be a bad idea. I suppose there's always the chance that the crew was abusing its privileges, but even then, it wouldn't take a great deal of effort to contact the dispatcher to confirm that they are picking up or dropping off a patient. I just find this puzzling.