Jim Stone has said that since 2005, cars have been able to be remotely controlled:
"Federally mandated always on cellular internet connection in all cars 2005 and later provides a remote access point through which ANY car can be hacked, provided you are high enough in the government to be priviledged with the ability to use this connection."
jimstonefreelance.com/carhack.html
It was said he had a heart attack a while back, and that 10 minutes passed before he had medical attention. If true, Brock might be incapacitated or even dead. After it happened, he disappeared from the media. There wasn't even a follow-up report on his condition, which is odd since he was directing the assault against Trump, receiving a lot of media attention. Before it happened, someone had posted that he was going to die in a week.