We don't know, but just as there are some illnesses, anomolies, etc. that are more prone to certain races or sexes in humans I'm sure that would also hold true for snakes. But we don't know for sure. Maybe I'm wrong, but wouldn't a snake without scales or exposed skin be more prone to skin diseases, blisters, irritations, etc. I can't imagine that thier skin could provide the same protection for them as scales, against rodent bites and scratches, parasites, etc. I would also assume they would be more prone to burns than a snake with scales. Their belly scales are a huge part of their locomotion, are they able to move normally? Are they able to properly grip their prey? I can't even begin to think what else their scales would be used for holding in heat or keeping out moisture or for their metabolism????? And what about the lack of heat pits, are they able to identify prey - probably by smell but would you want to put a live rat in with something that has so little protection against possible bites or scratches that wouldn't be able to properly judge the prey? Will it recognize F/T by smell alone?? Are they able to properly thermoregulate without pits? Too many unanswered questions.
If I'm wrong I'm wrong, but it seems to me that your putting the snake up to bat with two strikes against him.
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Tosha 
"Stupid is forever, ignorance can be fixed." Don Wood
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