The cop suspected it wasn't valid (either rationally or irrationally - cops unfortunately get their way in those cases, as long as they can make a plausible argument). If a cop pulls someone over and suspects the person's driver's license isn't valid then he has cause to refuse to let the person continue driving - he'll face absolutely no consequences (other than presumably his boss will make note of it and if the cop makes a lot of goofy decisions then he'll most likely get fired at some point).

There may have been abuse of power in the MA case - two court systems have said there wasn't - the circuit court decision was unanimous.

Hell...it happened in Massachusetts.

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“A man who lies to himself, and believes his own lies, becomes unable to recognize truth, either in himself or in anyone else." Fyodor Dostoevsky
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"Public office is the last refuge of the incompetent." Boies Penrose
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"Just an old sweet song keeps Georgia on my mind" Stuart Gorrell