It isn't law makers, it's the common law system. The law isn't just statutes, but also law created by judges over all of US and even English history. Most of th

It isn't law makers, it's the common law system. The law isn't just statutes, but also law created by judges over all of US and even English history. Most of the law surrounding traffic stops is created entirely by court rulings. The big stuff is more clear but there are always exceptions. So no, a cop can't just enter your house without a weapon. EXCEPT: if they are in hot pursuit of a criminal; as part of a legal arrest; to save someones life; etc. But each of those rules has wrinkles that local courts have rules on.