You can use calls to bring them in. Same calls you use for coyotes will work.
Another way is to find some berry bushes, and sit near them.
Another way is to sit on a gut pile.
Just remember in Colorado you have to bring out all the edible meat, and the head and hide for inspection.
Nope! It's natural, and will be there if you hunt or not. It's a grey area if you kill an animal just for the purpose of sitting on the gut pile.
Pretty fun hunt. Find where oak, aspen, pinyon and water come together and you will find bears.
BTW you are in a great bear area. 30 and 21 are great. Grand Mesa is great and the Uncompahgre is great.
I have been eyeing both those units. Can't decide which one to choose yet...