I'm not mistaken. You better check the following which is taken straight out of the regulations brochure:

Legal small-Game hunting methods: for fur bearers
1. Any rifle, handgun, shotgun, handheld bow or crossbow or live traps — limited to cage or box traps.

illegal small-game hunting methods: (Includes FURBEARERS)
1. The use of toxicants, drugs, explosives, stupefying substances or leghold traps, instant kill body-gripping design traps or snares to hunt,kill, capture, injure or harass wildlife are illegal, except with permits issued by CPW or the Colorado Department of Agriculture.

http://wildlife.state.co.us/SiteColl.../smallgame.pdf

If you're going give advice, give proper advice so you don't get someone a citation. When they talk about permits, they aren't talking about a furbearers license, they are talking about special collection permits or problem animal control/government trappers and your average guy isn't going to get one of those. Colorado lost most of its trapping years ago. I know because I was there when it happened and had to sell my traps because I couldn't use them any more.