Further, the information provided must be credible and must comprise an important part of any case which is initiated or, if no case is initiated, must have provided a sufficient basis on which a case could have been brought.Tampering:  Altering for an improper purpose or in an improper way; bringing improper influence to bear; interfering improperly; obstructing, misleading or engaging in any fraudulent conduct to alter results or prevent normal procedures from occurring.