Ok, one at a time. First, traffic stops. A busted taillight allows for a traffic stop. It does not allow for a search. When the officer approaches the car (which he lawfully does in order to write the ticket) if he sees or smells something that gives him probable cause to believe an additional crime is being committed, then he can search, based on ascending probable cause. It is called the "plain view doctrine." If an officer is in a place lawfully and then sees or smells something suspicious, he can continue to investigate. The taillight infraction alone does not give the right to search. Next, the Supreme Court interprets the law. They do not pass laws but they interpret the laws passed by Congress. They ruled the human genome does not qualify as something innovative that can be patented because it exists naturally. And finally, we get to stem cell research. It is heavily funded in the US, presently, and many labs are moving full speed ahead. There was a legal issue when George Bush was president and he issued a ban on Embryonic Stem Cell research. That created what scientists referred to as the Stem Cell Winter. It lasted until February of 2009 when Barrack Obama became president and rescinded the ban. I hesitate to bring up politics because they are so divisive and obnoxious. I made an exception this one time because that is what actually happened. Once the ban was lifted thing went back to normal.