Contractor will obtain an agreement from any consortium, specimen collection service, laboratory and/or Medical Review Officer providing drug/alcohol testing services under this agreement that upon submission by ExxonMobil of a list, or lists, of Government Work Identification Numbers, chain-of-custody ID numbers and test dates: 1) the laboratory will verify that the tests were conducted as represented; and 2) the laboratory and/or Contractor Medical Review Officer will provide a sworn statement that each of the tests identified by ExxonMobil were confirmed as negative or that it/he/she cannot so swear.