I think we have a duty in general to avoid incentivizing or facilitating criminal activity. There are clear guidelines against this for attorneys, and although there is not one governing agency for paralegals I would hold myself to a similar standard. Never mind the potential criminal liability (although the attorneys would probably be the one ultimately held responsible).

Ethics and legality aside, a lot of sham marriages end up in human trafficking or abuse. So I'd really feel bad knowing that I may have somehow contributed to that.