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Section 17290 Of Division 2. Definitions From California Penal Code >> Division 2. >> Title 1. >> Part 6.

17290
. As used in this part, "undetectable knife" means any knife or other instrument, with or without a handguard, that satisfies all of the following requirements:
  (a) It is capable of ready use as a stabbing weapon that may inflict great bodily injury or death.
  (b) It is commercially manufactured to be used as a weapon.
  (c) It is not detectable by a metal detector or magnetometer, either handheld or otherwise, which is set at standard calibration.