Authorities have filed drug charges against a Northwest Iowa couple. The Buena Vista County Sheriff and the Alta police have charged 32-year-old Chad Larson and 32-year Cynthia Larson in connection with searches conducted at their Alta residence in December… and their former residence in rural Buena Vista County last October. Chad Larson was charged with manufacturing methamphetamine, manufacturing a controlled substance, possession with intent to deliver, and three counts of child endangerment. Cynthia Larson was charged with three counts of child endangerment. In addition, the both face charges of Manufacturing Methamphetamine… Failure to Affix a Drug Tax Stamp and Prohibited Acts.