The state of Colorado has active laws that allow its residents to apply for, and, barring disqualification, receive a permit to carry concealed handguns in most areas of the state. One of the requirements of obtaining a concealed carry permit is completion of a handgun training class, taught by a certified instructor, within the last 10 years.
The following excerpts are taken from Colorado law (current at the time of this publication, but should be verified):
18-12-203. Criteria for obtaining a permit. (1) BEGINNING ON THE EFFECTIVE DATE OF THIS PART 2, EXCEPT AS OTHERWISE PROVIDED IN THIS SECTION, A SHERIFF SHALL ISSUE A PERMIT TO CARRY A CONCEALED HANDGUN TO AN APPLICANT WHO:
(h) DEMONSTRATES COMPETENCE WITH A HANDGUN BY SUBMITTING:
(VI) A TRAINING CERTIFICATE FROM A HANDGUN TRAINING CLASS OBTAINED WITHIN THE TEN YEARS PRECEDING SUBMITTAL OF THE APPLICATION. THE APPLICANT SHALL SUBMIT THE ORIGINAL TRAINING CERTIFICATE OR A PHOTOCOPY THEREOF THAT INCLUDES THE ORIGINAL SIGNATURE OF THE CLASS INSTRUCTOR. IN OBTAINING A TRAINING CERTIFICATE FROM A HANDGUN TRAINING CLASS, THE APPLICANT SHALL HAVE DISCRETION IN SELECTING WHICH HANDGUN TRAINING CLASS TO COMPLETE.
(2) "CERTIFIED INSTRUCTOR" MEANS AN INSTRUCTOR FOR A FIREARMS SAFETY COURSE WHO IS CERTIFIED AS A FIREARMS INSTRUCTOR BY:
(a) A COUNTY, MUNICIPAL, STATE, OR FEDERAL LAW ENFORCEMENT AGENCY;
(b) THE PEACE OFFICER STANDARDS AND TRAINING BOARD CREATED IN SECTION 24-31-302, C.R.S.;
(c) A FEDERAL MILITARY AGENCY; OR
(d) A NATIONAL NONPROFIT ORGANIZATION THAT CERTIFIES FIREARMS INSTRUCTORS, OPERATES NATIONAL FIREARMS COMPETITIONS, AND PROVIDES TRAINING, INCLUDING COURSES IN PERSONAL PROTECTION, IN SMALL ARMS SAFETY, USE, AND MARKSMANSHIP.
The law lists other requirements, most of which must be addressed personally by the applicant, and are not related to training. The above excerpts are not meant to provide a complete description of all requirements, or substitute for professional legal advice.