The OP asked to drop the fixie issue in this thread. But, since others persist, I retract my earlier comments. Practically speaking there is a strong argument for at least a front brake on a fixie. But, legally speaking, the only point the cop has is to assert that there is no technical brake on the bike. That reverse pedaling on a fixie is equivalent functionally (close enough) to a coaster brake, which is legal, should be all that matters, legally.