The expiration date of your visa is the last day you may use the visa to enter the United States. It does not indicate how long you may stay in the United States. Your stay is determined by the Department of Homeland Security at your port of entry.
In some circumstances, a person may be released from custody without bail and be given an order to appear, with certain conditions as governed and directed by a court-affiliated agency. Project Remand ('PR'), a Ramsey County pre-trial court service program, is one example of such an agency.
United States Government - Independent Agencies. Independent Agencies of the Unites States government are tasked with administering the law as regarding specific areas such as the environment, social security, and veteran affairs. These Agencies are expert in the area they manage and are generally headed by a Board or Commission, while a few, such as the EPA, are headed by a single Administrator.