Does the law still have control over the whole human race?
Yes. The law was given specifically to Israel, yet Paul states that all the world might be brought under its guilt. Therefore the law still exercises control over the whole human race, not just Israel, because its guilt extends to all people.
Les explains that Exodus chapter 20 begins with God, Elohim, speaking, then the Lord God, Jehovah, who was intrinsically involved with Israel. The law was specifically given to those under the law, yet Paul in the same breath says all the world might be brought under its guilt. Les concludes that while the law was given to Israel, it still has control over the whole human race.