I've done my fair share of research and all evidence says NOT TO EVER SIGN FOR A PACK. There are some exceptions, as in, express packs or overnight packs usually will require a signature.
What i'm wondering is if they are having you sign for evidence of you receiving pack, does this always result in a CD or could they possibly have you keep pack and try to bust you on the next one.
Also assuming that LE won't spend 6 figures + to stop a domestic personal pack receiver, but if weight were involved would it change the situation at all?
CD's nuts