Sentence examples for been difficult to prove from inspiring English sources

At this early stage, treatment might be more effective although this has been difficult to prove.

Russia's military intervention in Ukraine has been difficult to prove beyond a doubt.

None of the perpetrators were ever prosecuted, ostensibly because ownership of the stone would have been difficult to prove.

Adverse health effects from doses significantly higher than natural background but smaller than from documented cases of high exposures have been difficult to prove.

Mr. Jaccarino was so drunk, Ms. Walton told Judge Melissa A. Crane, that it would have been difficult to prove that he meant to assault Ms. Soler.

Ms. O'Connell told him that it would have been difficult to prove that Mr. Afzal had a seizure just before the car crashed, Mr. Ricco said.

That is difficult to prove.

However, that is difficult to prove.

"It is difficult to prove," he said.

Rape cases are difficult to prove.

Discrimination would be difficult to prove.