You sure about that?
Matrix specialists on high alert will focus on the runners - they can't just randomly attack drone traffic - especially not if members of the sec force have been hurt. I want to see the Spider who randomly attacks drones that are sending their Emergency signal.
If what you say were true a typical rigger couldn't bring his drones on any run.
Also: B&B p.4
"DocWagon also holds exclusive contracts with a number of high-profile vehicle and drone manufacturers, including Ares, Hughs, and Aeroquip Designs. These companies manufacture and maintain DocWagon’s various ambulance platforms."