Prior to 2006 "ballistic proof", aka, 'bullet proof' door panels were available from "after-market" vendors. Beginning with model year 2006, Ford offered them as a "factory option" in the P71 Package on their Crown Victoria. At $2400.00 for the two front doors it was a rather expensive option, so in many cases when the car was retired and sent to auction the Kevlar panels would be removed for use on the new police cruiser.

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