better, more CP cost-effective solution:
Set up a "trap" of sorts, if you will: a stand offering "free" beer to anyone who can provide a valid tank piloting license--the catch being that the beer is only free if said pilot downs an entire six pack within the space of one turn. Consuming that amount of alcohol in such a relatively short time span will inevitably result in the tank pilot's complete inebriation, and, upon resuming his role behind the controls of his machine of death, he will likely be far too wasted to know the "fire giant canon" peddle from the break peddle. The theoretical outcome being either the drunken annihilation of his own team, or at least running several red lights and weaving in and out of traffic enough to get pulled over. The first case is obviously the better, but in the case of the latter, he will most definitely be at least issued a court date, until which he will have his license revoked and be unable to drive his tank, nullifying the threat. He also might die of severe hangover.