Opinion makers have observed that one of the most challenging aspects of a corruption case is distinguishing between political contributions and bribes. Bribes can be delivered in a variety of ways and the quid pro quo can be extremely difficult to establish.
評論者指出，貪污罪最棘手處，即在釐清「政治獻金」與「賄賂」的不同，因為賄賂可透過各種隱微的方式進行，「對價關係」極難確認。