No. The vast majority of the measurement errors that we see are not due to fraud or tampering. They are due to either a failure to properly maintain and calibrate these devices, or to wear and tear... These devices often remain in service for a long time without being calibrated. Wear and tear is inevitable and these devices become less accurate over time. But in the great majority of cases, it is not a matter of fraud or other such things.
On June 3rd, 2010. See this statement in context.