In CO evidence of sex must be attached to the carcass until it is processed. But if you process it in the field like I have been known to do then you don't have to keep the evidence of sex but I'll usually do so and put it in a ziploc bag in case the warden wants to see it. never had one want to though once it has been cut and packaged. Kind of hard to leave evidence of sex attached to a package of burger.