The I601 is a waiver for various inadmissibility grounds. Not only is more information needed but you should be working with an attorney in these matters. For a free consultation follow the link and fill out the form on my website or just give me a call.
I agree with the previous answer. You only file the I-601 if you are seeking a waiver of inadmissibilty. If you are concerned that your husband might need to file for a waiver, you should definitely be seeking the advice of an immigration attorney.