Welcome to operating in the US. If you are a FMCSA approved broker, you have to expect to abide by the US laws. What you have to remember is that if legal action is taken, it usually takes place in the location where the action took place. In other words, if the carrier you hired has an accident in Cincinnati, the action will be in Cincinnati and if you're pulled into the lawsuit, you will be required to be represented there. I do anticipate that in time, in the absence of a FMCSA approved broker, the beneficial freight owner (BFO) will also be pulled into the lawsuit. Lawyers are constantly trying to peel back the onion to find another layer that may have some skin in the game.
Once in a lawsuit, you'll learn very quickly about what is expected. You will receive a statement of claim that will have 30 pages of all the items you should have reviewed before sending this carrier down the road. Yes, it's a boilerplate but if one or more of those items apply, and were overlooked, it will determine the amount of risk you may be facing. They don't care how hard it is to vet the carrier, it's your job to do so with the exact measure that will limit, diminish or extinguish your liability.
Carriers and their insurance companies deal with this all the time. That driver who just got in an accident better be squeaky clean with hundreds of thousands of proven miles driven and no accidents, incidents or tickets. That one overweight fine from 4 years ago will somehow show up and be used against the carrier to show how this driver is inattentive to his job, has a no-care attitude, and is likely the ultimate reason for this accident. It's the same reason why insurance companies are quick to sign off on any claim.
Like I said earlier, it is a very high bar to reach showing that the broker is negligent to a degree that will amount to much. I expect a couple high prolific cases to come forward very quickly that, when complete, will set the basis for case law. The hope is that brokers remain cognizant of who they are hiring and not just anybody and this new ruling will help that.