I hadn't heard of this before. But I'm a bit confused, how does an uber driver hit someone while searching for fares? Searching for fares in Uber means sitting in your car waiting for your phone to ding. The only reason to be moving around without a passenger is if you think that a different neighborhood is a better place to be to find passengers (as distance to the prospective passenger is important), but driving to another neighborhood certainly doesn't qualify as "searching" for anything.
I would imagine that a large number of the drivers actually do drive around while searching as some areas are just awful to find parking in. Really the safest thing that Uber could do is to make it policy to only search over drivers that aren't in transit. Might hurt their buisness, but it is technically possible and most likely would give them a pretty strong defense against their product causing harm.
