Respectfully, once the deputy located the empty tractor and trailer parked in the roadway with a load of piglets, the driver's phone, wallet, cash, inside the cab, and no sign of the driver, it was the job of LE to assess the scene as suspicious and worth protecting the scene. It was hardly the wife's place to tell LE how to do their job!
The deputy phoned Sarah using David's phone -- at this point, LE responded quickly as Sarah had hoped and found the truck -- and when David wasn't found slumped over inside the cab, but instead the rig parked in the roadway, shut-off with the piglets still in the trailer, this wasn't a medical event!
In other words, claiming a medical event was intended for the call to be given priority status and additional resources searching for the truck and driver, and it worked -- with the exception the driver is still missing. MOO