fewer consent forms than participants
age and sex of consent form signatures don't match participant cohort
consent forms do not consent to an aspect of the research process
consent forms from clearly illiterate subjects or indicate in some other way that subjects do not understand the nature of the research, and methodology does not deal with this.

Take for example that retracted study where the authors basically state that their research on Uighur DNA "might be useful for the police"..

If you said that about, say, African-Americans in a ghetto I think most people would be suspicious of the level of informed consent given and want to look into it.

[–] Umbrias@beehaw.org 1 points 6 months ago

I'll also point out "the forms weren't detailed enough to resolve the concerns raised" directly implies that not only were these sorts of inconsistencies then investigated, but that the forms didn't provide information to allow the investigators to understand why (or why not) it was ethically performed.

The paperwork isn't there for no reason, if it isn't sufficient to cya, it's not actually doing anything for you beyond ritual, and you'd need to redesign your forms or accounting to correct that.