Those who have labored to establish his innocence have faced as much difficulty as those who have struggled to prove his guilt.

CNN: Moxley Case: Excerpts from the Sutton Report

In the past, vote-buying has been hard to prove because of the difficulty of obtaining evidence.

ECONOMIST: Thailand

But history shows a pattern: when attractions prove too expensive to maintain, score low on guest approval, lose sponsorship or have difficulty churning through high numbers of visitors, they are likely to meet the wrecking ball.

BBC: Walt Disney World's most endangered attractions