regarding/about

[navi tasan]

Which are correct:

1) Concerning certain people in this group we don't know if they have a criminal record or not.
2) There are certain people in this group regarding whom we don't know if they have a criminal record or not.
3) There are certain people in this group about whom we don't know if they have a criminal record or not.

Gratefully,
Navi.

 

[bhaisahab]

They are all overly wordy and unnatural.

 

[emsr2d2]

We don't know if some people in this group have a criminal record [or not].
There are some people in this group whose criminal history we don't know.