Not sure about the legality it seems to me it likely is but Im not anAmerican immigration lawyer but its an awfully large risk to take. If theauthor of that affidavit is questioned and the customs officer learns of thisheshe will be awfully suspicious. If the affidavit is a sham then DO NOT DOIT. Any misrepresentation will get you deported ....fast. If you areconsidering paying someone to be a joint sponsor it would seem that you havesome resources of your own. Why not rely on your own income and assets in yourapplication and thereby not risk arousing the suspicions of the Customsauthorities. You have no right of appeal in this process so I personally thinkit is not worth the risk.