[night862]

Are you saying that the only check possible is looking at it while its in your hand?

[sethammons]

The problem stated was that the marker machine lies 1 out of 15 entries. The paper would contain an incorrect selection occasionally. So, yeah, it would require no one noticing during the act.

[worstspotgain]

Indeed, and the math is the same. If out of 3 million voters, just 1000 double-check the printout, they will detect a 1/100 flip with probability 99.996%.