If you would be using a conventional loan to finance the property there would be no problem - only your credit, debt and income would be considered. If you want to use FHA to finance the purchase, his credit would need to be pulled and his debts would need to be included when calculating your debt ratio.
This is really a legal question and you might consider speaking to an Attorney about it. It's a subject that is on the "edge" between real estate and law. Since Realtors are typically not Attorneys, Realtor's should probably not answer in terms of giving you guidance. If you need a referral to a pre-screened Realtor (who may also be an Attorney) please contact me privately.