Marijuana stores in Colorado open Jan. 1, while sales in Washington for the newly legalized recreational drug will start later in the year. Starting in January, transgender students in California can choose which restroom to use and whether to play on boys’ or girls’ sports teams. Unregistered assault guns and large-capacity ammunition magazines will be considered illegal contraband as of Jan. 1 in Connecticut. In Maine, health care providers will have to provide to patients a list of prices of the most common health services and procedures, a law designed to boost transparency around medical costs. Read about other new laws going into effect around the country in 2014.