Testing

The USMLE program has established rules to govern administration of the examinations to ensure that no examinee or group of examinees receives unfair advantage on the examination, inadvertently or otherwise. The rules include standard test administration conditions consistent with the principles on which the examinations are developed and scored. For example, examinations are designed to sample knowledge across specified content domains, and unauthorized access to examination content prior to testing violates that principle.
If there is a reason to believe that the integrity of the examination process is jeopardized, the USMLE parent organizations may invalidate all or any part of an examination. If information indicates that continued testing would jeopardize the security of examination materials or the integrity of scores, the USMLE parent organizations reserve the right to suspend or cancel test administration.

• Testing Regulations and Rules of Conduct

• Personal Items

• Admission to the Test

• Step 1, Step 2 CK, and Step 3

• Step 2 CS

Source: http://usmleworldwide.com/blog/?p=1115