Today's episode of Through the Wormhole with Morgan Freeman highlighted the budding technology concerning human reproduction. Part of the episode showed a man who had successfully gestated and "birthed" dozens of sharks completely outside of the womb of the mother. According to him the only necessary thing left for him to do this with a human baby is permission, and a deeper understanding of the conditions inside the womb throughout the gestation so that he can properly replicate it safely.
"Viability outside of the Womb" is not a valid argument. The entire process can happen without the mother.
We can't do that with humans, we don't have the technology. Sharks and humans are quite different (ectotherms have a different gestation process and don't have the same kind of temperature regulations that endotherms do). Until such point as that scientist actually can do that with a mammal (like a mouse) he would NEVER receive funding to try it on a human.
You can't legislate today based on what technology tomorrow might bring tomorrow save for when you are trying to fund research directly.