That's odd that they even put it on the list. They only occur where it's not legal to collect garters, or any other reptile for that matter. It's illegal to collect any reptiles fro Riverside or San Diego counties. It's possible with the recent changes that marcianus is no longer considered threatened. However, unless riverside county lifted their ban on collecting reptiles, then it doesn't matter of California allows collecting them. If you can only find them in a county where collecting is illegal, then good luck collecting any legally.