Colorado House Bill 08-1185 (also known as HB 1185) will go into effect in January of '09. Simply put, it mandates that all cats and dogs released from animal shelters of any kind (pounds, shelters, rescues--even those based out of homes or networks of foster homes) must be spayed or neutered before being adopted.
There are only two exceptions to this policy:
1. A veterinarian has determined that it is not safe to have the animal sterilized at that time.
2. The adopter puts down a 90-day deposit, and if they don't show vet proof of the spay/neuter in that time, they don't get their deposit back. (The deposit then gets sent to either the state Pet Overpopulation Fund, or another established spay/neuter program.) The rescue can also take back the pet from the adoptive family.
You can read the full text of the bill here, but be warned, it has a lot more words than this post. Heh.