As we rang in a new year, a number of new laws also went into effect in Missouri. One makes cancer medicine a lot cheaper as a new state law increases access to chemotherapy pills. Advocates say those drugs typically have fewer harmful side effects compared to traditional I.V. drugs. Prior to the new law, the pills could end up costing patients thousands of dollars more than I.V. chemotherapy. Other laws taking effect today (Thursday) include one requiring women be notified after a mammogram that dense breast tissue can hide signs of cancer; another mandates the state create a handbook to help train adult daycare providers and a new law increases fees for companies that violate federal natural gas safety standards.