Surely investigations or monitoring have been conducted, I'd expect, in some cases, by folks belonging to A Certain Party that tends to oppose making voting eas

Surely investigations or monitoring have been conducted, I'd expect, in some cases, by folks belonging to A Certain Party that tends to oppose making voting easier and so would have strong motivations to turn up problems and, particularly, actual voter fraud, then make those findings very well and widely known. Have the officials performing those complained of inadequate tools or transparency to spot voter fraud? I'd very much expect so, if it is hard to know and that's pretty much the problem. So perhaps they have.