53-5-704. Bureau duties -- Permit to carry concealed firearm -- Certification for concealed firearms instructor -- Requirements for issuance -- Violation -- Denial, suspension, or revocation -- Appeal procedure.
(1) (a) The bureau shall issue a permit to carry a concealed firearm for lawful self defense to an applicant who is 21 years of age or older within 60 days after receiving an application, unless the bureau finds proof that the applicant does not meet the qualifications set forth in Subsection (2).
(b) The permit is valid throughout the state for five years, without restriction, except as otherwise provided by Section 53-5-710.
(c) The provisions of Subsections 76-10-504(1) and (2), and Section 76-10-505 do not apply to a person issued a permit under Subsection (1)(a).
The following law, mentioned in the quote above that CFP holders are exempt from observing, specifies a "concealed dangerous weapon".
76-10-504. Carrying concealed dangerous weapon -- Penalties.
(1) Except as provided in Section 76-10-503 and in Subsections (2), (3), and (4), a person who carries a concealed dangerous weapon, as defined in Section 76-10-501, including an unloaded firearm on his or her person or one that is readily accessible for immediate use which is not securely encased, as defined in this part, in or on a place other than the person's residence, property, a vehicle in the person's lawful possession, or a vehicle, with the consent of the individual who is lawfully in possession of the vehicle, or business under the person's control is guilty of a class B misdemeanor.
(2) A person who carries a concealed dangerous weapon which is a loaded firearm in violation of Subsection (1) is guilty of a class A misdemeanor.
Characteristics of "dangerous weapons" and "concealed dangerous weapons" are listed below:
(3) (a) "Concealed dangerous weapon" means a dangerous weapon that is:
(i) covered, hidden, or secreted in a manner that the public would not be aware of its presence; and
(ii) readily accessible for immediate use.
(6) (a) "Dangerous weapon" means an item that in the manner of its use or intended use is capable of causing death or serious bodily injury.
(b) The following factors shall be used in determining whether a knife, or another item, object, or thing not commonly known as a dangerous weapon is a dangerous weapon:
(i) the character of the instrument, object, or thing;
(ii) the character of the wound produced, if any;
(iii) the manner in which the instrument, object, or thing was used; and
(iv) the other lawful purposes for which the instrument, object, or thing may be used.
Clearly, an auto knife, among other tools, fits the bill as a dangerous weapon, concealed or not, that a CFP holder is allowed to carry because the CFP holder is exempt from those portions of the above laws that prohibit possession/carry of those dangerous items, just as 76-10-505 exempts the CFP holder from the prohibition against carrying a loaded firearm.
Since most of Utah's laws are prohibitive rather than permissive, anything that is not specifically prohibited is allowed.