Colorado Code § 18-12-113

Failure to report a lost or stolen firearm - exception
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(1) (a) (I) A person
who owns a firearm and who has reasonable cause to believe that the firearm has been lost or
stolen shall report such fact to a law enforcement agency not more than five days after
discovering that the firearm has been lost or stolen. A report of a lost or stolen firearm must
include, and the law enforcement agency receiving the report shall request, an accurate and
detailed description of the firearm, including, to the extent known, the manufacturer, model,
serial number, caliber, and any other identification number or distinguishing mark of the firearm
being reported.
(II) A person other than the owner of a lost or stolen firearm who is a member of the
owner's family or who resides with the owner may report the loss or theft to a law enforcement
agency. If a person who is not the owner of a lost or stolen firearm makes the report, the owner
is not required to report pursuant to subsection (1)(a)(I) of this section. Making a report pursuant
to this subsection (1)(a)(II) does not constitute acknowledgment of ownership of the firearm for
the purposes of any other provision of law.
(b) A person who previously reported a lost or stolen firearm pursuant to this section
who has found or otherwise recovered the firearm, or any other person who has found or
recovered the firearm, shall report to the law enforcement agency that received the report that the
firearm has been recovered.
(c) Except as provided in subsection (3) of this section, a person who knowingly violates
subsection (1)(a)(I) of this section commits failure to report a lost or stolen firearm.
(2) Failure to report a lost or stolen firearm is a civil infraction, punishable by a twenty-
five dollar fine; except that a second or subsequent offense is an unclassified misdemeanor and,
upon conviction thereof, shall be punished by a fine of not more than five hundred dollars.
(3) This section does not apply to a licensed gun dealer, as defined in section 18-12-506.
(4) Within five days after receiving a report of a lost or stolen firearm pursuant to this
section, the law enforcement agency that receives the report shall enter any available descriptive
information related to the lost or stolen firearm into the Colorado bureau of investigation crime
information center database.
(5) [Editor's note: This version of subsection (5) is effective until January 1, 2025.] A
person who reports a lost or stolen firearm pursuant to subsection (1) of this section is immune
from criminal prosecution for an offense in this part 1 related to the storage of firearms.
(5) [Editor's note: This version of subsection (5) is effective January 1, 2025.] A
person who reports a lost or stolen firearm pursuant to subsection (1) of this section is immune
from criminal prosecution for an offense in this part 1 related to the storage of firearms and from
prosecution for the civil infraction of unlawful storage of a firearm in a vehicle as described in
section 18-12-114.5.
(6) This section is known and may be cited as the "Isabella Joy Thallas Act".

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