A total of 27 speeding cases were thrown out by Judge Elizabeth MacGrath at Nenagh Court because the company that operates the system, Go Safe, failed to have their documenation in order.
A further 13 cases were adjourned because the defendants failed to turn up in court or had themselves sought an adjournment.
When the first case was called solicitor Elizabeth McKeever asked if the certificate authorising the speed vans to operate had been signed by the relevant person.
Sgt Michael Keating said it had not and Ms McKeever argued the summons was flawed, which was accepted by the judge.
As many as eight Go Safe staff spent the morning in court.