Now all you need is the proper amount of collusion/corruption between the certifying agency and the manufacturer to have a magic box that does whatever the one paying the bills want. Might seem far fetched in a developped country, until you read about the Boeing/FAA thing happened.
As far as I could find the courts basically decided that there has to be a way to examine how a result was reached if there was any doubt about it. That the PTB still allowed their use didn't change that and if a case got to court the results could get thrown out. The PTB probably doesn't care because only a small percentage of speeding cases end up in court.
