The allegations in Ohio that the machines that tabulate the votes have a bias can be easily checked, and this is going on with the Ohio recount.
Actually, no. In many counties, the elections director is cherry-picking the sample precincts to hand-count to check the machines, rather than choosing them randomly, as required by law.
They are supposed to recount by hand if the hand- and machine-counts don't match in these precincts. In practice, counties are replacing the machines and trying again until they get a match, then doing the entire recount by machine.