Hello:
Below would be an example using a criteria that is on a form:
SELECT tblStaff.StaffID, tblStaff.FirstName, tblStaff.LastName, tblStaff.Address, tblStaff.City, tblStaff.State
FROM tblStaff
WHERE (((tblStaff.State)=[Forms]![frmForm1]![txtState]));
Please see my example db enclosed below...