Walgreens' recent acquisition and immediate closure of three independent community pharmacies in the St. Louis area has raised questions about the privacy of customers' prescription records. Some former customers of the three sold pharmacies have complained that, as part of the Nov. 30 sale, their medical files were transferred to Walgreen Co. without their consent, violating their privacy. Other former customers of the sold pharmacies say they encountered difficulty and delays in arranging for Walgreens to transfer their prescription records to another pharmacy of their choice.