Small Towns Can Be Murder by Connie Shelton (A Charlie Parker Mystery Series, Book 4) from Books In Motion.com

Charlie Parker is asked to look into a controversial series of miscarriages in a small town in New Mexico that's heavily populated by Mexicans. The town has one medical clinic. Her first assumption is to look for some type of environmental problem such as pesticides but that draws a blank. Then she shifts her suspicions onto the medical industry and finds herself embroiled in politics regarding health care among minorities. It's when the dead bodies start to show up that she realizes she's onto something far bigger than she imagined and far deadlier...