[WalterBright]

Have a third party do the testing.

[wcarey]

While that might (or might not) mitigate one perverse incentive, there are lots more. It's important for policy proposals to take unintended consequences into account. What others can you foresee and how would you mitigate them?

[duckmysick]

What will be their incentive? Bonuses for the number of tests graded?